A simple calculator written with QT

The software design course has been held for three or four times. I feel that I have not done anything. I feel that this course is purely nonsense. Tomorrow is Monday. I should have handed in something anyway, so I wrote a calculator for myself over the weekend.

Widget. h:

 

/* <Br/> * copyright (c) 2011 @ hit footoo lab <br/> * Author: shiyanhui <br/> * Create Date: 2011-3-20 <br/> */<br/> # ifndef widget_h <br/> # define widget_h <br/> # include <qwidget> <br/> class qstring; <br/> class qlineedit; <br/> class qpushbutton; <br/> class qhboxlayout; <br/> class qvboxlayout; <br/> class Widget: public qwidget <br/>{< br/> q_object <br/> Public: <br/> widget (qwidget * parent = 0); <br/> private slots: <br/> void pushoperatorbutton (); <br/> void pushnumberbutton (); <br/> void pushbracketbutton (); <br/> void pushclearbutton (); <br/> PRIVATE: <br/> void declarevariables (); <br/> void createlayout (); <br/> void createconnect (); <br/> qlineedit * expressionlineedit; <br/> qpushbutton * numberpushbuttons [10]; <br/> qpushbutton * bracketpushbuttons [2]; <br/> qpushbutton * operatorpushbuttons [5]; <br/> qpushbutton * clearpushbutton; <br/> // For left down row pushbuttons <br/> qhboxlayout * leftdownrowlayout [4]; <br/> // For right down row pushbuttons <br/> qhboxlayout * rightdownrowlayout [3]; <br/> // For left layout <br/> qvboxlayout * leftdownlayout; <br/> // For right layout <br/> qvboxlayout * rightdownlayout; <br/> // For down layout <br/> qhboxlayout * downlayout; <br/> // For up layout <br/> qhboxlayout * uplayout; <br/> // for global layout <br/> qvboxlayout * globallayout; <br/> }; <br/> # endif // widget_h <br/>

Widget. cpp:

/* <Br/> * copyright (c) 2011 @ hit footoo lab <br/> * Author: shiyanhui <br/> * Create Date: 2011-3-20 <br/> */<br/> # include "calculate. H "<br/> # include" widget. H "<br/> # include <qtgui> <br/> Widget: widget (qwidget * parent): <br/> qwidget (parent) <br/>{< br/> declarevariables (); <br/> createlayout (); <br/> createconnect (); <br/>}< br/> void Widget: pushoperatorbutton () <br/> {<br/> qpushbutton * apushbutton = dynamic_cast <qpushbutton *> (sender ()); <br/> for (INT I = 0; I <4; ++ I) <br/>{< br/> If (apushbutton = operatorpushbuttons [I]) <br/>{< br/> expressionlineedit-> insert (apushbutton-> text (); <br/> return; <br/>}< br/> calculation acalculation (expressionlineedit-> text (). tostdstring (); <br/> acalculation. midfix_to_suffix (); <br/> acalculation. calculate (); <br/> expressionlineedit-> settext (qstring ("% 1 "). arg (acalculation. get_answer (); <br/>}< br/> void Widget: pushnumberbutton () <br/>{< br/> qpushbutton * apushbutton = dynamic_cast <qpushbutton *> (sender (); <br/> for (INT I = 0; I <10; ++ I) <br/>{< br/> If (apushbutton = numberpushbuttons [I]) <br/> expressionlineedit-> insert (qstring ("% 1 "). arg (I); <br/>}< br/> void Widget: pushbracketbutton () <br/>{< br/> qpushbutton * apushbutton = dynamic_cast <qpushbutton *> (sender (); <br/> for (INT I = 0; I <2; ++ I) <br/>{< br/> If (apushbutton = bracketpushbuttons [I]) <br/> expressionlineedit-> insert (apushbutton-> text ()); <br/>}< br/> void Widget: pushclearbutton () <br/>{< br/> expressionlineedit-> clear (); <br/>}< br/> void Widget: declarevariables () <br/>{< br/> // declare lineedit of expression <br/> expressionlineedit = new qlineedit (); <br/> // declare number pushbuttons <br/> for (INT I = 0; I <10; ++ I) <br/> {<br/> numberpushbuttons [I] = new qpushbutton (qstring ("% 1 "). arg (I); <br/> numberpushbuttons [I]-> setdefault (true ); <br/>}< br/> // declare brackets pushbuttons <br/> const qstring brackets [2] = {"(",")"}; <br/> for (INT I = 0; I <2; ++ I) <br/> {<br/> bracketpushbuttons [I] = new qpushbutton (brackets [I]); <br/>}< br/> // declare operator pushbuttons <br/> const qstring operators [5] = {"+ ","-","*", "/", "=" };< br/> for (INT I = 0; I <5; I ++) <br/> {<br/> operatorpushbuttons [I] = new qpushbutton (operators [I]); <br/>}< br/> // declare clear Pushbutton <br/> clearpushbutton = new qpushbutton ("clear "); <br/> // declare layout <br/> uplayout = new qhboxlayout; <br/> downlayout = new qhboxlayout; <br/> // declare leftdown row layout <br/> for (INT I = 0; I <4; I ++) <br/>{< br/> leftdownrowlayout [I] = new qhboxlayout; <br/>}< br/> leftdownlayout = new qvboxlayout; <br/> // declare rightdown row layout <br/> for (INT I = 0; I <3; I ++) <br/>{< br/> rightdownrowlayout [I] = new qhboxlayout; <br/>}< br/> rightdownlayout = new qvboxlayout; <br/> globallayout = new qvboxlayout; <br/>}< br/> // built the connect <br/> void Widget: createconnect () <br/>{< br/> for (INT I = 0; I <10; ++ I) <br/>{< br/> qobject :: connect (numberpushbuttons [I], signal (clicked (), this, slot (pushnumberbutton (); <br/>}< br/> for (INT I = 0; I <5; ++ I) <br/> {<br/> qobject: connect (operatorpushbuttons [I], signal (clicked (), this, slot (pushoperatorbutton (); <br/>}< br/> for (INT I = 0; I <2; ++ I) <br/>{< br/> qobject: connect (bracketpushbuttons [I], signal (clicked (), this, slot (pushbracketbutton ())); <br/>}< br/> qobject: connect (clearpushbutton, signal (clicked (), this, slot (pushclearbutton ())); <br/>}< br/> void Widget: createlayout () <br/>{< br/> uplayout-> addwidget (expressionlineedit ); <br/> // left down <br/> const int num1 [3] = {7, 4, 1}; <br/> for (INT I = 0; I <3; ++ I) <br/> {<br/> for (Int J = 0; j <3; ++ J) <br/> {<br/> leftdownrowlayout [I]-> addwidget (numberpushbuttons [J + num1 [I]); <br/>}< br/> leftdownrowlayout [3]-> addwidget (numberpushbuttons [0]); <br/> leftdownrowlayout [3]-> addwidget (bracketpushbuttons [0]); <br/> leftdownrowlayout [3]-> addwidget (bracketpushbuttons [1]); <br/> for (INT I = 0; I <4; ++ I) <br/>{< br/> leftdownlayout-> addlayout (leftdownrowlayout [I]); <br/>}< br/> // right down <br/> const int num2 [2] = {0, 2 }; <br/> for (INT I = 0; I <2; ++ I) <br/>{< br/> for (Int J = 0; j <2; + + J) <br/>{< br/> rightdownrowlayout [I]-> addwidget (operatorpushbuttons [J + num2 [I]); <br/>}< br/> rightdownrowlayout [2]-> addwidget (operatorpushbuttons [4]); <br/> rightdownrowlayout [2]-> addwidget (clearpushbutton); <br/> for (INT I = 0; I <3; ++ I) <br/>{< br/> rightdownlayout-> addlayout (rightdownrowlayout [I]); <br/>}< br/> downlayout-> addlayout (leftdownlayout ); <br/> downlayout-> addstretch (); <br/> downlayout-> addlayout (rightdownlayout); <br/> globallayout-> addlayout (uplayout ); <br/> globallayout-> addlayout (downlayout); <br/> This-> setlayout (globallayout); <br/>}< br/>

Calculate. h:

/* <Br/> * copyright (c) 2011 @ hit footoo lab <br/> * Author: shiyanhui <br/> * Create Date: 2011-3-20 <br/> */<br/> # ifndef calculate_h <br/> # define calculate_h <br/> # include <string> <br/> # include <sstream> <br/> # include <map> <br/> # define stack_size 100 <br/> using namespace STD; <br/> struct charstack <br/>{< br/> int size; <br/> char element [stack_size]; <br/> }; <br/> struct intstack <br/>{< br/> int size; <br/> int element [stack_size]; <br/> }; <br/> class calculation <br/> {<br/> Public: <br/> // constructor <br/> calculation (string ); <br/> // The infix expression is converted to a suffix expression <br/> void midfix_to_suffix (); <br/> // calculate <br/> void calculate (); <br/> // obtain the result <br/> int get_answer (); <br/> PRIVATE: <br/> string expression; // expression <br/> int answer; // result <br/> charstack operator_stack; // storage operator <br/> intstack operand_stack; // Storage Operations <br/> stringstream SS; <br/> Map <char, int> AMAP; // operator-to-priority ing <br/>}; <br/> # endif <br/>

Calculate. cpp:

/* <Br/> * copyright (c) 2011 @ hit footoo lab <br/> * Author: shiyanhui <br/> * Create Date: 2011-3-20 <br/> */<br/> # include "calculate. H "<br/> calculation: calculation (string expression) <br/>{< br/> This-> Expression = expression; <br/> answer = 0; <br/> operator_stack.size = operand_stack.size = 0; <br/> AMAP ['C'] = 0; <br/> AMAP ['+'] = AMAP ['-'] = 1; <br/> AMAP ['*'] = AMAP ['/'] = 2; <br/>}< br/> void calculation: midfix_to_suffix () <br/>{< br/> string TMP = ""; <br/> // scan the expression again <br/> for (INT I = 0; I <expression. size ();) <br/>{< br/> // if the character is a number, continue the loop until the number is fully searched, add '. ', separated from other numbers <br/> If (isdigit (expression [I]) <br/> {<br/> while (I <expression. size () <br/>{< br/> If (isdigit (expression [I]) <br/>{< br/> TMP + = expression [I ++]; <br/>}< Br/> else <br/> break; <br/>}< br/> TMP + = '. '; <br/>}< br/> // if it is a space, ignore <br/> else if (expression [I] = '') <br/>{< br/> I ++; <br/> continue; <br/>}< br/> // other operators can only be <br/> else <br/> {<br/> If (expression [I] = '( ') <br/>{ <br/> operator_stack.element [operator_stack.size + +] = '('; <br/> I ++; <br/>}< br/> else if (expression [I] = ') <br/>{< br/> while (operator_st Ack. Element [operator_stack.size-1]! = '(') <Br/>{< br/> TMP + = operator_stack.element [-- operator_stack.size]; <br/>}< br/> operator_stack.size --; <br/> I ++; <br/>}< br/> else <br/>{< br/> while (operator_stack.size> 0) <br/> {<br/> If (AMAP [expression [I] <= AMAP [operator_stack.element [operator_stack.size-1]) <br/>{< br/> TMP + = operator_stack.element [-- operator_stack.size]; <br/>}< br/> else <br/> Break; <Br/>}< br/> operator_stack.element [operator_stack.size ++] = expression [I ++]; <br/>}< br/> while (operator_stack.size> 0) <br/>{< br/> TMP + = operator_stack.element [-- operator_stack.size]; <br/>}< br/> Expression = TMP; <br/>}< br/> void calculation: Calculate () <br/>{< br/> int A = 0, B = 0, num = 0; <br/> for (INT I = 0; I <expression. size ();) <br/>{< br /> If (isdigit (expression [I]) <br/>{< br/> string TMP = ""; <br/> while (expression [I]! = '. ') <Br/>{< br/> TMP + = expression [I ++]; <br/>}< br/> I ++; <br/> SS <TMP; <br/> SS> num; <br/> SS. clear (); <br/> operand_stack.element [operand_stack.size ++] = num; <br/>}< br/> else <br/> {<br/> B = operand_stack.element [-- operand_stack.size]; <br/> A = operand_stack.element [-- operand_stack.size]; <br/> switch (expression [I]) <br/> {<br/> case '+': <br/> operand_stack.element [operand_stack.size ++] = A + B; <br/> break; <br/> case '-': <br/> operand_stack.element [operand_stack.size ++] = A-B; <br/> break; <br/> case '*': <br/> operand_stack.element [operand_stack.size ++] = a * B; <br/> break; <br/> case '/': <br/> operand_stack.element [operand_stack.size ++] = A * 1.0/B; <br/>}< br/> I ++; <br/>}< br/> answer = operand_stack.element [0]; <br/>}< br/> int calculation: get_answer () <br/>{< br/> return answer; <br/>}< br/>

Main. cpp:

/* <Br/> * copyright (c) 2011 @ hit footoo lab <br/> * Author: shiyanhui <br/> * Create Date: 2011-3-20 <br/> */<br/> # include <qtgui/qapplication> <br/> # include "widget. H "<br/> int main (INT argc, char * argv []) <br/>{< br/> qapplication A (argc, argv ); <br/> widget W; <br/> W. show (); <br/> return a.exe C (); <br/>}< br/>

Laizhang:

 

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