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Qt实现计算器

Qt实现计算器
Qt实现计算器

Qt设计报告----------------计算器实现

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myWidget.h文件代码如下：

#ifndef MYWIDGET_H

#define MYWIDGET_H

#include

#include

#include

class myWidget:public QWidget

{

Q_OBJECT

private:

QString Q1,Q2;//Q1和Q2是分别用来保存操作数QString Q3;//用于保存操作数

char c; //c用于保存运算符..

QLineEdit*lineEdit;

//第一行按钮

QPushButton *bMAdd; //保存数据按钮

QPushButton *bMSub; //读取数据按钮

QPushButton *bClear; //清理屏幕按钮

QPushButton *bAdd; //’+‘按钮

//第二行按钮

QPushButton *b1; //’1‘按钮

QPushButton *b2; //‘2’按钮

QPushButton *b3; //’3‘按钮

QPushButton *bSub; //’-‘按钮

//第三行按钮

QPushButton *b4; //’4‘按钮

QPushButton *b5; //’5‘按钮

QPushButton *b6; //’6‘按钮

QPushButton *bMul; //’*‘按钮

//第四行按钮

QPushButton *b7; //’7‘按钮

QPushButton *b8; //‘8’按钮

QPushButton *b9; //‘9’按钮

QPushButton *bDiv; //‘/’按钮

//第五行按钮

QPushButton *bPoi; //‘.’按钮

QPushButton *b0; //‘0’按钮

QPushButton *bEqual; //‘=’按钮

public:

myWidget(){

Q1="0";

Q2="0";

Q3="0";

c=' ';

this->setMinimumSize(300,290);

this->setMaximumSize(300,290);

QWidget *editwindow=new QWidget(this);//编辑窗口

editwindow->setGeometry(40,20,220,50);

lineEdit=new QLineEdit("欢迎使用就算器",editwindow);//显示输入框lineEdit->setGeometry(0,0,220,50);

lineEdit->setReadOnly(1);//设置为只读，不允许直接修改文本框

QWidget *buttonwindow=new QWidget(this);

buttonwindow->setGeometry(0,90,300,200);

bMAdd=new QPushButton("M+",buttonwindow);//第一行按钮bMAdd->setGeometry(40,0,40,20);

bMSub=new QPushButton("M-",buttonwindow);

bMSub->setGeometry(100,0,40,20);

bClear=new QPushButton("clear",buttonwindow);

bClear->setGeometry(160,0,40,20);

bAdd=new QPushButton("+",buttonwindow);

bAdd->setGeometry(220,0,40,20);

b1=new QPushButton("1",buttonwindow);//第二行按钮

b1->setGeometry(40,40,40,20);

b2=new QPushButton("2",buttonwindow);

b2->setGeometry(100,40,40,20);

b3=new QPushButton("3",buttonwindow);

b3->setGeometry(160,40,40,20);

bSub=new QPushButton("-",buttonwindow);

bSub->setGeometry(220,40,40,20);

b4=new QPushButton("4",buttonwindow);//第三行按钮

b4->setGeometry(40,80,40,20);

b5=new QPushButton("5",buttonwindow);

b5->setGeometry(100,80,40,20);

b6=new QPushButton("6",buttonwindow);

b6->setGeometry(160,80,40,20);

bMul=new QPushButton("*",buttonwindow);

bMul->setGeometry(220,80,40,20);

b7=new QPushButton("7",buttonwindow);//第四行按钮

b7->setGeometry(40,120,40,20);

b8=new QPushButton("8",buttonwindow);

b8->setGeometry(100,120,40,20);

b9=new QPushButton("9",buttonwindow);

b9->setGeometry(160,120,40,20);

bDiv=new QPushButton("/",buttonwindow);

bDiv->setGeometry(220,120,40,20);

b0=new QPushButton("0",buttonwindow);//第四行按钮

b0->setGeometry(40,160,40,20);

bPoi=new QPushButton(".",buttonwindow);

bPoi->setGeometry(100,160,40,20);

bEqual=new QPushButton("=",buttonwindow);

bEqual->setGeometry(160,160,40,20);

//信号连接

connect(bClear,SIGNAL(clicked()),this,SLOT(sClear()));

connect(b1,SIGNAL(clicked()),this,SLOT(s1()));

connect(b2,SIGNAL(clicked()),this,SLOT(s2()));

connect(b3,SIGNAL(clicked()),this,SLOT(s3()));

connect(b4,SIGNAL(clicked()),this,SLOT(s4()));

connect(b5,SIGNAL(clicked()),this,SLOT(s5()));

connect(b6,SIGNAL(clicked()),this,SLOT(s6()));

connect(b7,SIGNAL(clicked()),this,SLOT(s7()));

connect(b8,SIGNAL(clicked()),this,SLOT(s8()));

connect(b9,SIGNAL(clicked()),this,SLOT(s9()));

connect(b0,SIGNAL(clicked()),this,SLOT(s0()));

connect(bAdd,SIGNAL(clicked()),this,SLOT(sAdd()));

connect(bSub,SIGNAL(clicked()),this,SLOT(sSub()));

connect(bMul,SIGNAL(clicked()),this,SLOT(sMul()));

connect(bDiv,SIGNAL(clicked()),this,SLOT(sDiv()));

connect(bPoi,SIGNAL(clicked()),this,SLOT(sPoi()));

connect(bEqual,SIGNAL(clicked()),this,SLOT(sEqual()));

connect(bMAdd,SIGNAL(clicked()),this,SLOT(sMAdd()));

connect(bMSub,SIGNAL(clicked()),this,SLOT(sMSub()));

}

public slots: //自定义槽

void s1() //数字按键“1”的槽函数1-9同理

{

if(Q2=="0") Q2="1"; //如果Q2为0替代0

else //如果不是，获取当前文本编辑框内容,按一下按钮在文本框内容

{

Q2=lineEdit->text();

Q2.append('1');

}

lineEdit->setText(Q2); //将q2在文本编辑框中显示}

void s2()

{

if(Q2=="0") Q2="2";

else

{

Q2=lineEdit->text();

Q2.append('2');

}

lineEdit->setText(Q2);

}

void s3()

{

if(Q2=="0") Q2="3";

else

{

Q2=lineEdit->text();

Q2.append('3');

}

lineEdit->setText(Q2);

}

void s4()

{

if(Q2=="0") Q2="4";

else

{

Q2=lineEdit->text();

Q2.append('4');

}

lineEdit->setText(Q2);

}

void s5()

{

if(Q2=="0") Q2="5";

else

{

Q2=lineEdit->text();

Q2.append('5');

lineEdit->setText(Q2); }

void s6()

{

if(Q2=="0") Q2="6";

else

{

Q2=lineEdit->text();

Q2.append('6');

}

lineEdit->setText(Q2); }

void s7()

{

if(Q2=="0") Q2="7";

else

{

Q2=lineEdit->text();

Q2.append('7');

}

lineEdit->setText(Q2); }

void s8()

{

if(Q2=="0") Q2="8";

else

{

Q2=lineEdit->text();

Q2.append('8');

}

lineEdit->setText(Q2); }

void s9()

{

if(Q2=="0") Q2="9";

else

{

Q2=lineEdit->text();

Q2.append('9');

}

lineEdit->setText(Q2); }

void s0()

if(Q2=="0") Q2="0";

else

{

Q2=lineEdit->text();

Q2.append('0');

}

lineEdit->setText(Q2); //将q2在文本编辑框中显示

} //定义按钮0—9槽

void sPoi() //小数点槽

{

if(Q2=="0") Q2="0.";

else

{

Q2=lineEdit->text();

Q2.append('.');

}

lineEdit->setText(Q2);

}

void sAdd()//加号槽

{

double n,m;

Q2=lineEdit->text();

if(c==' ') //如果c为空格键，说明现在是第一次运算，那么不进行任何操作，只是将Q2复制给Q1同时保存这一次的操作符，以便下一次计算.

{

Q1=Q2;

Q2="0";

c='+';

}

else

{

n=Q1.toDouble(); //如果上一次已经有运算符，那么将Q1,Q2都转换成浮点数

m=Q2.toDouble();

if(c=='+') n=n+m;

if(c=='-') n=n-m;

if(c=='*') n=n*m;

if(c=='/') n=n/m; //实现运算

Q1=QString::number(n,'f',10); //再转换回字符形式

Q2="0"; //将Q2重新初始化

c='+';

lineEdit->setText(Q1); //显示中间结果

}

void sSub() //减号槽{

double n,m;

Q2=lineEdit->text();

if(c==' ')

{

Q1=Q2;

Q2="0";

c='-';

}

else

{

n=Q1.toDouble();

m=Q2.toDouble();

if(c=='+') n=n+m;

if(c=='-') n=n-m;

if(c=='*') n=n*m;

if(c=='/') n=n/m;

Q1=QString::number(n,'f',10);

Q2="0";

c='-';

lineEdit->setText(Q1);

}

}

void sDiv() //除号槽{

double n,m;

Q2=lineEdit->text();

if(c==' ')

{

Q1=Q2;

Q2="0";

c='/';

}

else

{

n=Q1.toDouble();

m=Q2.toDouble();

if(c=='+') n=n+m;

if(c=='-') n=n-m;

if(c=='*') n=n*m;

if(c=='/') n=n/m;

Q1=QString::number(n,'f',10);

Q2="0";

c='/';

lineEdit->setText(Q1);

}

}

void sMul() //乘号槽{

double n,m;

Q2=lineEdit->text();

if(c==' ')

{

Q1=Q2;

Q2="0";

c='*';

}

else

{

n=Q1.toDouble();

m=Q2.toDouble();

if(c=='+') n=n+m;

if(c=='-') n=n-m;

if(c=='*') n=n*m;

if(c=='/') n=n/m;

Q1=QString::number(n,'f',10);

Q2="0";

c='*';

lineEdit->setText(Q1);

}

}

void sEqual() //等号键槽{

double n,m;

Q2=lineEdit->text();

if(c==' '){

Q1=Q2;

Q2="0";

lineEdit->setText(Q1);

c='=';

}

else{

n=Q1.toDouble();

m=Q2.toDouble();

if(c=='+') n=n+m;

if(c=='-') n=n-m;

if(c=='*') n=n*m;

if(c=='/') n=n/m;

Q1=QString::number(n,'g',10);

Q2="0";

c=' ';

lineEdit->setText(Q1);

Q1="0";

}

}

void sClear()

{

Q1="0";

Q2="0";

c=' ';

lineEdit->setText(Q2);

}

void sMAdd()

{

Q3=lineEdit->text();

}

void sMSub()

{

Q2=Q3;

lineEdit->setText(Q2);

}

};

#endif

calculate.cpp文件代码如下：

#include

#include"myWidget.h"

int main(int argc,char**argv)

{

QApplication a(argc,argv);

myWidget*mainwindow=new myWidget();//主窗口

a.setActiveWindow(mainwindow);

mainwindow->show();//显示窗口

return a.exec();

}

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