Calculator class (string)
by Shinigami on Apr.05, 2012, under C++
Calculator class to count equations given to object as a string. This class can be easy extended.
File calculator.h
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#ifndef CALCULATOR #define CALCULATOR #include <string> using namespace std; class Calculator { /* This class calculates equation given as a string. * Author: Doanatas Azaravicius * Date: 2012-03-17 * Site: cplusplus.shinigami.lt * * function show_errors() will return error code. * error codes: * 100 - no errors. * 102 - one of parenthesis was not found. * 103 - wrong equation. * 104 - function not found. * 105 - sqrt() can't be used on negative numbers. * 106 - 0 can't be divisor. */ public: Calculator(); ~Calculator() {} void add_to_equation(string); void delete_from_equation(unsigned int); void delete_from_equation(); double count_equation(); int show_errors() const; private: //Variables string equation; string parenthesis; string key_actions; static const int amount_of_actions = 3; static const int amount_of_functions = 12; string actions[amount_of_actions]; string functions[amount_of_functions]; double PI; int error_code; void find_parenthesis(int []); void find_function_name(int []); int find_key_operations(string, int []); int find_operation(string, bool); int find_first_key_operation(size_t *, int); string reverse_string(string); string double_to_string(double); double count_element_in_equation(string); double count_function(double, string); double string_to_double(string); bool check_key_action(string &, int &); void count_actions(string &); int factorial(int); }; #endif //CALCULATOR |
File calculator.cc
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#include <stdlib.h> #include <cstring> #include <math.h> #include <sstream> #include "calculator.h" #include <iostream> using namespace std; Calculator::Calculator() { equation = ""; PI = 3.14159265; error_code = 100; parenthesis = "()"; key_actions = "*/+-"; functions[0] = "sqrt"; functions[1] = "sin"; functions[2] = "tan"; functions[3] = "cos"; functions[4] = "acos"; functions[5] = "asin"; functions[6] = "atan"; functions[7] = "ln"; functions[8] = "log"; functions[9] = "sinh"; functions[10] = "tanh"; functions[11] = "cosh"; actions[0] = "^"; actions[1] = "%"; actions[2] = "!"; } void Calculator::add_to_equation(string line) { equation += line; } void Calculator::delete_from_equation(unsigned int amount) { size_t length = equation.length(); if (length > amount) { length -= amount; equation.erase(length); } else { equation.clear(); } } void Calculator::delete_from_equation() { equation.clear(); } double Calculator::count_equation() { //variables used in this method. double result = 0.0; int found_parenthesis_location[2], temp_location; string element_of_equation; //check if equation are not empty. if (equation.empty()) { return result; } do { //find parenthesis locations in equation. find_parenthesis(found_parenthesis_location); if (error_code > 100) { return result; } //takes part of equation. element_of_equation = equation.substr(found_parenthesis_location[0] + 1, found_parenthesis_location[1] - found_parenthesis_location[0] - 1); //counts element of equation. result = count_element_in_equation(element_of_equation); if (error_code > 100) { return result; } //if parenthesis was found and they aren't in begining of equation search if here are function name before left parenthesis. if (found_parenthesis_location[0] > 0) { temp_location = found_parenthesis_location[0]; find_function_name(found_parenthesis_location); if (error_code > 100) { return result; } //if function name was found count that function if (temp_location > found_parenthesis_location[0]) { result = count_function(result, equation.substr(found_parenthesis_location[0], temp_location - found_parenthesis_location[0])); } if (error_code > 100) { return result; } } //if parenthesis was found change equation. Change part of equation which was counted to it's result and recalculate equation. if (found_parenthesis_location[0] > 0) { equation.replace(found_parenthesis_location[0], found_parenthesis_location[1] - found_parenthesis_location[0] + 1, double_to_string(result)); } } while (found_parenthesis_location[0] > 0); return result; } double Calculator::count_function(double number, string line) { double result; //checks which function need to be used and calculates given number. if (line == functions[0]) { if (number < 0) { error_code = 105; return number; } result = sqrt(number); } else if (line == functions[1]) result = sin(number * PI / 180); else if (line == functions[2]) result = tan(number * PI / 180); else if (line == functions[3]) result = cos(number * PI / 180); else if (line == functions[4]) result = acos(number) * 180 / PI; else if (line == functions[5]) result = asin(number) * 180 / PI; else if (line == functions[6]) result = atan(number) * 180 / PI; else if (line == functions[7]) result = log(number); else if (line == functions[8]) result = log10(number); else if (line == functions[9]) result = sinh(number); else if (line == functions[10]) result = tanh(number); else if (line == functions[11]) result = cosh(number); else { //if function name are not found in functions[] gives back error code and returns 0.0. error_code = 104; result = number; } return result; } double Calculator::count_element_in_equation(string line) { double result = 0.0, number[2]; int location[3]; int fined_key_action; count_actions(line); do { //find locations of key operations in string and operation. fined_key_action = find_key_operations(line, location); if (error_code > 100) { return result; } if (fined_key_action < 0) { return string_to_double(line); } //find number to count. number[0] = string_to_double(line.substr(location[0] + 1, location[1] - location[0] - 1)); number[1] = string_to_double(line.substr(location[1] + 1, location[2] - location[1] - 1)); //count numbers. if (fined_key_action == 0) { result = number[0] * number[1]; } else if (fined_key_action == 1) { if (number[1] == 0) { error_code = 106; return result; } result = number[0] / number[1]; } else if (fined_key_action == 2) { result = number[0] + number[1]; } else if (fined_key_action == 3) { result = number[0] - number[1]; } //if not all string was counted change string and recount it. if ((location[0] > 0) or (location[2] < (int)line.length())) { line.replace(location[0] + 1, location[2] - location[0] - 1, double_to_string(result)); } } while ((location[0] > 0) or (location[2] < (int)line.length())); return result; } void Calculator::find_function_name(int location[]) { char symbol = equation[location[0] - 1]; bool found_symbol = false; int location_temp; if (symbol != parenthesis[0]) { for (int i = 0; i < 4; i++) { if (symbol == key_actions[i]) { found_symbol = true; } } } if (!found_symbol) { location_temp = find_operation(reverse_string(equation.substr(0, location[0])), true); if (error_code > 100) { return; } if (location_temp < 0) { location[0] = 0; } else { location[0] = location[0] - location_temp; } } } void Calculator::find_parenthesis(int parenthesis_location[]) { string element_of_equation; //find right parenthesis location in equation. parenthesis_location[1] = equation.find(parenthesis[1]); if (parenthesis_location[1] != (int)string::npos) { //if right parenthesis was found, take part of equation for left parenthesis seatch. element_of_equation = reverse_string(equation.substr(0, parenthesis_location[1])); //fine left parenthesis. parenthesis_location[0] = element_of_equation.find(parenthesis[0]); if (parenthesis_location[0] != (int)string::npos) { //if left parenthesis was found specify location of left parenthesis in full equation. parenthesis_location[0] = element_of_equation.length() - parenthesis_location[0] - 1; } else { //if left parenthesis was not found, but right was found set error_code. error_code = 102; } } else { //if right parenthesis was not found, find left parenthesis location. parenthesis_location[0] = equation.find(parenthesis[0]); if (parenthesis_location[0] != (int)string::npos) { //if left parenthesis was found, but left not set error_code. error_code = 102; } else { //if no parenthesis was found, set locations of parenthesis before and behind equation. parenthesis_location[0] = -1; parenthesis_location[1] = equation.length(); } } } int Calculator::find_key_operations(string line, int location[]) { int result = -1; //find location of key operations between numbers. location[1] = find_operation(line, false); if (error_code > 100) { return result; } if (location[1] < 0) { return result; } location[0] = find_operation(reverse_string(line.substr(0, location[1])), true); if (error_code > 100) { return result; } if (location[0] < 0) { location[0] = -1; } else { location[0] = location[1] - location[0] - 1; } location[2] = find_operation(line.substr(location[1] + 1), true); if (error_code > 100) { return result; } if (location[2] < 0) { location[2] = location[1] + line.substr(location[1] + 1).length() + 1; } else { location[2] = location[2] + location[1] + 1; } //find key operation number to return. if (line[location[1]] == key_actions[0]) { return 0; } else if (line[location[1]] == key_actions[1]) { return 1; } else if (line[location[1]] == key_actions[2]) { return 2; } else if (line[location[1]] == key_actions[3]) { return 3; } return result; } int Calculator::find_operation(string line, bool reverse) { size_t found[4]; int result; bool check; for (int i = 0; i < 4; i++) { found[i] = line.find(key_actions[i]); } if (!reverse) { if (found[0] == string::npos and found[1] == string::npos) { if (found[2] == string::npos and found[3] == string::npos) { return -1; } else if (found[2] == 0) { error_code = 103; return 0; } else if (found[3] == 0) { result = find_operation(line.substr(1), reverse) + 1; if (error_code > 100) { return -1; } } else if (found[2] == string::npos) { result = found[3]; } else if (found[3] == string::npos) { result = found[2]; } if (found[2] > found[3]) { result = found[3]; } else { result = found[2]; } check = check_key_action(line, result); if (error_code > 100) { return result; } if (check) { return result; } return -1; } if (found[0] == 0 or found[1] == 0) { error_code = 103; return 0; } if (found[0] == string::npos) { result = found[1]; } else if (found[1] == string::npos) { result = found[0]; } else if (found[0] < found[1]) { result = found[0]; } else { result = found[1]; } check = check_key_action(line, result); if (error_code > 100) { return result; } if (check) { return result; } return -1; } else { for (int i = 0; i < 4; i++) { if (found[i] == string::npos) { found[i] = line.length(); } else if (found[i] == (line.length() - 1)) { found[i] = -1; } } if ((found[0] == found[1]) and (found[0] == found[2]) and (found[0] == found[3])) { return -1; } result = find_first_key_operation(found, 4); check = check_key_action(line, result); if (error_code > 100) { return result; } if (check) { return result; } return -1; } } bool Calculator::check_key_action(string & line, int & place) { size_t temp, length = line.length(); if (place < (int)length) { if (place == -1) { return true; } else { temp = place + 1; } if (line[temp] == key_actions[0] or line[temp] == key_actions[1] or line[temp] == key_actions[2]) { error_code = 103; return false; } else if (line[temp] == key_actions[3]) { if (line[place] == key_actions[3]) { line.replace(place, 2, "+"); } else if (line[place] == key_actions[2]) { line.replace(place, 2, "-"); } } } if (place > 0) { temp = place - 1; if (line[place] == key_actions[3]) { if (line[temp] == key_actions[3]) { line.replace(place - 1, 2, "+"); place = temp; } else if (line[temp] == key_actions[2]) { line.replace(place - 1, 2, "-"); place = temp; } else if (line[temp] == key_actions[0] or line[temp] == key_actions[1]) { place = temp; } } else { if (line[temp] == key_actions[0] or line[temp] == key_actions[1] or line[temp] == key_actions[2] or line[temp] == key_actions[3]) { error_code = 103; return false; } } } return true; } void Calculator::count_actions(string & line) { int location[3]; double number[2], result; for (int i = 0; i < amount_of_actions;) { location[1] = line.find(actions[i]); if (location[1] == (int)string::npos) { i++; } else { location[0] = find_operation(reverse_string(line.substr(0, location[1])), true); if (error_code > 100) { return; } if (location[0] < 0) { location[0] = -1; } else { location[0] = location[1] - location[0] - 1; } location[2] = find_operation(line.substr(location[1] + 1), true); if (error_code > 100) { return; } if (location[2] < 0) { location[2] = location[1] + line.substr(location[1] + 1).length() + 1; } else { location[2] = location[2] + location[1] + 1; } number[0] = string_to_double(line.substr(location[0] + 1, location[1] - location[0] - 1)); number[1] = string_to_double(line.substr(location[1] + 1, location[2] - location[1] - 1)); if (i == 0) { result = pow(number[0], number[1]); } else if (i == 1) { result = (int)number[0] % (int)number[1]; } else if (i == 2) { result = factorial((int)number[0]); } line.replace(location[0] + 1, location[2] - location[0] - 1, double_to_string(result)); } } } string Calculator::double_to_string(double number) { string result; stringstream str; str << number; str >> result; return result; } int Calculator::find_first_key_operation(size_t * x, int y) { int number; number = x[0]; for (int i = 1; i < y; i++) { if ((int)number > (int)x[i]) { number = x[i]; } } return number; } double Calculator::string_to_double(string line) { stringstream convert; convert << line; double result; convert >> result; return result; } string Calculator::reverse_string(string line) { string::reverse_iterator it; string result; for (it = line.rbegin(); it < line.rend(); it++) { result += *it; } return result; } int Calculator::factorial(int number) { if (number <= 1) { return number; } return (number * factorial(number - 1)); } int Calculator::show_errors() const { return error_code; } |
GUI for calculator class made with GTKMM
File gtkmm_calculator.h
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#ifndef GTKMM_CALCULATOR_H #define GTKMM_CALCULATOR_H #include <gtkmm.h> #include "calculator.h" class GTKmmCalculator : public Gtk::Window { public: GTKmmCalculator(); virtual ~GTKmmCalculator(); protected: void put_in_calculator(Glib::ustring); void on_button_clicked(Glib::ustring); Glib::ustring double_to_string(double number); bool on_key_press_event(GdkEventKey *event); Gtk::Box VBox_main, HBox_entry, HBox_buttons, VBox_buttons1, VBox_buttons2, HBox_buttons1, HBox_buttons2, HBox_buttons3, HBox_buttons4, HBox_buttons5, HBox_buttons6, HBox_buttons7, HBox_buttons8; Gtk::Button Button_0, Button_1, Button_2, Button_3, Button_4, Button_5, Button_6, Button_7, Button_8, Button_9, Button_plus, Button_minus, Button_division, Button_multiplication, Button_comma, Button_equals, Button_clear, Button_delete, Button_right_parenthesis, Button_left_parenthesis, Button_pow, Button_sqrt, Button_mod, Button_sin, Button_cos, Button_tan, Button_log, Button_ln, Button_pi, Button_asin, Button_acos, Button_atan, Button_sinh, Button_cosh, Button_tanh, Button_e, Button_factorial; Gtk::Entry main_entry; Calculator equation; }; #endif //GTKMM_CALCULATOR_H |
File gtkmm_calculator.cc
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#include "calculator.h" #include "gtkmm_calculator.h" #include <sstream> #include <cstdlib> #include <iostream> using namespace std; GTKmmCalculator::GTKmmCalculator() : VBox_main(Gtk::ORIENTATION_VERTICAL, 5), HBox_entry(Gtk::ORIENTATION_HORIZONTAL, 5), HBox_buttons(Gtk::ORIENTATION_HORIZONTAL, 5), VBox_buttons1(Gtk::ORIENTATION_VERTICAL, 2), VBox_buttons2(Gtk::ORIENTATION_VERTICAL, 2), HBox_buttons1(Gtk::ORIENTATION_HORIZONTAL, 2), HBox_buttons2(Gtk::ORIENTATION_HORIZONTAL, 2), HBox_buttons3(Gtk::ORIENTATION_HORIZONTAL, 2), HBox_buttons4(Gtk::ORIENTATION_HORIZONTAL, 2), HBox_buttons5(Gtk::ORIENTATION_HORIZONTAL, 2), HBox_buttons6(Gtk::ORIENTATION_HORIZONTAL, 2), HBox_buttons7(Gtk::ORIENTATION_HORIZONTAL, 2), HBox_buttons8(Gtk::ORIENTATION_HORIZONTAL, 2), Button_0("0"), Button_1("1"), Button_2("2"), Button_3("3"), Button_4("4"), Button_5("5"), Button_6("6"), Button_7("7"), Button_8("8"), Button_9("9"), Button_plus("+"), Button_minus("-"), Button_division("/"), Button_multiplication("*"), Button_comma("."), Button_equals("="), Button_clear("C"), Button_delete("<--"), Button_right_parenthesis(")"), Button_left_parenthesis("("), Button_pow("^"), Button_sqrt("sqrt"), Button_mod("%"), Button_sin("sin"), Button_cos("cos"), Button_tan("tan"), Button_log("log"), Button_ln("ln"), Button_pi("Pi"), Button_asin("asin"), Button_acos("acos"), Button_atan("atan"), Button_sinh("sinh"), Button_cosh("cosh"), Button_tanh("tanh"), Button_e("e"), Button_factorial("x!") { set_size_request(350, 80); set_border_width(1); set_title("Calculator"); set_resizable(false); set_icon_from_file("icon_calc.png"); Button_0.set_size_request(20,20); Button_1.set_size_request(20,20); Button_2.set_size_request(20,20); Button_3.set_size_request(20,20); Button_4.set_size_request(20,20); Button_5.set_size_request(20,20); Button_6.set_size_request(20,20); Button_7.set_size_request(20,20); Button_8.set_size_request(20,20); Button_9.set_size_request(20,20); Button_0.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "0" )); Button_1.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "1" )); Button_2.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "2" )); Button_3.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "3" )); Button_4.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "4" )); Button_5.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "5" )); Button_6.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "6" )); Button_7.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "7" )); Button_8.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "8" )); Button_9.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "9" )); Button_plus.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "+" )); Button_minus.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "-" )); Button_division.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "/" )); Button_multiplication.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "*" )); Button_comma.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "." )); Button_equals.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "=" )); Button_clear.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "C" )); Button_delete.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "del" )); Button_right_parenthesis.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), ")" )); Button_left_parenthesis.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "(" )); Button_pow.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "^" )); Button_sqrt.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "sqrt(" )); Button_mod.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "%" )); Button_sin.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "sin(" )); Button_cos.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "cos(" )); Button_tan.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "tan(" )); Button_log.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "log(" )); Button_ln.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "ln(" )); Button_pi.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "3.14159" )); Button_asin.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "asin(" )); Button_acos.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "acos(" )); Button_atan.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "atan(" )); Button_sinh.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "sinh(" )); Button_cosh.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "cosh(" )); Button_tanh.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "tanh(" )); Button_e.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "2.71828" )); Button_factorial.signal_clicked().connect( sigc::bind(sigc::mem_fun(*this, >KmmCalculator::on_button_clicked), "!" )); add(VBox_main); VBox_main.pack_start(HBox_entry); HBox_entry.pack_start(main_entry); main_entry.set_alignment(1.0); main_entry.set_text("0"); main_entry.set_editable(false); main_entry.set_has_frame(true); main_entry.set_activates_default(true); VBox_main.pack_start(HBox_buttons); HBox_buttons.pack_start(VBox_buttons1); HBox_buttons.pack_start(VBox_buttons2); VBox_buttons1.pack_start(HBox_buttons1); HBox_buttons1.pack_start(Button_0); HBox_buttons1.pack_start(Button_1); HBox_buttons1.pack_start(Button_2); HBox_buttons1.pack_start(Button_3); HBox_buttons1.pack_start(Button_4); VBox_buttons1.pack_start(HBox_buttons2); HBox_buttons2.pack_start(Button_5); HBox_buttons2.pack_start(Button_6); HBox_buttons2.pack_start(Button_7); HBox_buttons2.pack_start(Button_8); HBox_buttons2.pack_start(Button_9); VBox_buttons1.pack_start(HBox_buttons3); HBox_buttons3.pack_start(Button_plus); HBox_buttons3.pack_start(Button_minus); HBox_buttons3.pack_start(Button_division); HBox_buttons3.pack_start(Button_multiplication); HBox_buttons3.pack_start(Button_comma); VBox_buttons1.pack_start(HBox_buttons4); HBox_buttons4.pack_start(Button_delete); HBox_buttons4.pack_start(Button_clear); HBox_buttons4.pack_start(Button_equals); VBox_buttons2.pack_start(HBox_buttons5); HBox_buttons5.pack_start(Button_left_parenthesis); HBox_buttons5.pack_start(Button_right_parenthesis); HBox_buttons5.pack_start(Button_pow); HBox_buttons5.pack_start(Button_mod); HBox_buttons5.pack_start(Button_sqrt); VBox_buttons2.pack_start(HBox_buttons6); HBox_buttons6.pack_start(Button_sin); HBox_buttons6.pack_start(Button_cos); HBox_buttons6.pack_start(Button_tan); HBox_buttons6.pack_start(Button_log); HBox_buttons6.pack_start(Button_ln); VBox_buttons2.pack_start(HBox_buttons7); HBox_buttons7.pack_start(Button_asin); HBox_buttons7.pack_start(Button_acos); HBox_buttons7.pack_start(Button_atan); HBox_buttons7.pack_start(Button_sinh); HBox_buttons7.pack_start(Button_cosh); VBox_buttons2.pack_start(HBox_buttons8); HBox_buttons8.pack_start(Button_tanh); HBox_buttons8.pack_start(Button_factorial); HBox_buttons8.pack_start(Button_pi); HBox_buttons8.pack_start(Button_e); Button_equals.set_can_default(); Button_equals.grab_default(); add_events(Gdk::KEY_PRESS_MASK); signal_key_press_event().connect(sigc::mem_fun(*this, >KmmCalculator::on_key_press_event)); show_all_children(); } GTKmmCalculator::~GTKmmCalculator() { } void GTKmmCalculator::on_button_clicked(Glib::ustring line) { if (line == "C") { main_entry.set_text("0"); equation.delete_from_equation(); } else if (line == "=") { Glib::ustring result = double_to_string(equation.count_equation()); if (equation.show_errors() > 100) { result = "Error "; result += double_to_string(equation.show_errors()); result += ": bad equation."; } equation.delete_from_equation(); equation.add_to_equation(result); main_entry.set_text(result); } else if (line == "del") { equation.delete_from_equation(1); Glib::ustring entry_text; entry_text = main_entry.get_text(); if (entry_text.length() == 1) { main_entry.set_text("0"); } else { entry_text.erase(entry_text.length() - 1); main_entry.set_text(entry_text); } } else { Glib::ustring result = main_entry.get_text(); if (result == "0" && line != ".") { main_entry.set_text(""); } put_in_calculator(line); } } void GTKmmCalculator::put_in_calculator(Glib::ustring line) { main_entry.set_text(main_entry.get_text() + line); equation.add_to_equation(line); } Glib::ustring GTKmmCalculator::double_to_string(double number) { Glib::ustring result; stringstream str; str << number; result = str.str(); return result; } bool GTKmmCalculator::on_key_press_event(GdkEventKey *event) { switch (event->keyval) { case GDK_KEY_1: on_button_clicked("1"); break; case GDK_KEY_2: on_button_clicked("2"); break; case GDK_KEY_3: on_button_clicked("3"); break; case GDK_KEY_4: on_button_clicked("4"); break; case GDK_KEY_5: on_button_clicked("5"); break; case GDK_KEY_6: on_button_clicked("6"); break; case GDK_KEY_7: on_button_clicked("7"); break; case GDK_KEY_8: on_button_clicked("8"); break; case GDK_KEY_9: on_button_clicked("9"); break; case GDK_KEY_0: on_button_clicked("0"); break; case GDK_KEY_period: on_button_clicked("."); break; case GDK_KEY_minus: on_button_clicked("-"); break; case GDK_KEY_plus: on_button_clicked("+"); break; case GDK_KEY_asterisk: on_button_clicked("*"); break; case GDK_KEY_slash: on_button_clicked("/"); break; case GDK_KEY_parenleft: on_button_clicked("("); break; case GDK_KEY_parenright: on_button_clicked(")"); break; case GDK_KEY_percent: on_button_clicked("%"); break; case GDK_KEY_BackSpace: on_button_clicked("del"); break; case GDK_KEY_Delete: on_button_clicked("C"); break; case GDK_KEY_equal: on_button_clicked("="); break; default : ; } return true; } |
File run.cc
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#include "gtkmm_calculator.h" #include <gtkmm/main.h> int main(int argc, char *argv[]) { Gtk::Main kit(argc, argv); GTKmmCalculator window; Gtk::Main::run(window); return 0; } |
compile command for linux
g++ gtkmm_calculator.cc gtkmm_run.cc calculator.cc -o run pkg-config gtkmm-3.0 --cflags --libs
For it to work you need this pic to
Calculator looks like this:
