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calculator

界面文件

如图设置，设置多个按钮，以及显示界面的lineEdit。

文件组成

生成各按钮的槽函数

1.数字按钮部分

void Widget::setNum(int i)
{if(flag == false){num1 = num1 * 10 + i;ui->lineEdit->setText(QString::number(num1));}else{num2 = num2 * 10 + i;ui->lineEdit->setText(QString::number(num2));}
}void Widget::on_pushButton_0_clicked(){setNum(0);}
void Widget::on_pushButton_1_clicked(){setNum(1);}
void Widget::on_pushButton_2_clicked(){setNum(2);}
void Widget::on_pushButton_3_clicked(){setNum(3);}
void Widget::on_pushButton_4_clicked(){setNum(4);}
void Widget::on_pushButton_5_clicked(){setNum(5);}
void Widget::on_pushButton_6_clicked(){setNum(6);}
void Widget::on_pushButton_7_clicked(){setNum(7);}
void Widget::on_pushButton_8_clicked(){setNum(8);}
void Widget::on_pushButton_9_clicked(){setNum(9);}

2.运算符按钮

void Widget::on_pushButton_AD_clicked(){ui->lineEdit->setText("0");flag = true; sign = '+'; num2 = 0;}
void Widget::on_pushButton_SU_clicked(){ui->lineEdit->setText("0");flag = true; sign = '-'; num2 = 0;}
void Widget::on_pushButton_MU_clicked(){ui->lineEdit->setText("0");flag = true; sign = '*'; num2 = 0;}
void Widget::on_pushButton_DV_clicked(){ui->lineEdit->setText("0");flag = true; sign = '/'; num2 = 0;}

3.等号按钮

void Widget::on_pushButton_EQ_clicked()
{switch(sign){case '+':num1 += num2; ui->lineEdit->setText(QString::number(num1)); flag = false; break;case '-':num1 -= num2; ui->lineEdit->setText(QString::number(num1)); flag = false; break;case '*':num1 *= num2; ui->lineEdit->setText(QString::number(num1)); flag = false; break;case '/':num1 /= num2; ui->lineEdit->setText(QString::number(num1)); flag = false; break;}
}

4.删除按钮

void Widget::on_pushButton_BS_clicked()
{if(flag){num2 /= 10;ui->lineEdit->setText(QString::number(num2));}else{num1 /= 10;ui->lineEdit->setText(QString::number(num1));}
}

5.清空按钮

void Widget::on_pushButton_CL_clicked()
{num1 = 0;num2 = 0;flag = false;ui->lineEdit->setText("0");
}

6.正负按钮

void Widget::on_pushButton_AS_clicked()
{if(flag){num2 = -num2;ui->lineEdit->setText(QString::number(num2));}else{num1 = -num1;ui->lineEdit->setText(QString::number(num1));}
}

widget.h

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>QT_BEGIN_NAMESPACE
namespace Ui {
class Widget;
}
QT_END_NAMESPACEclass Widget : public QWidget
{Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();private slots:void setNum(int i);void on_pushButton_0_clicked();void on_pushButton_1_clicked();void on_pushButton_2_clicked();void on_pushButton_3_clicked();void on_pushButton_4_clicked();void on_pushButton_5_clicked();void on_pushButton_6_clicked();void on_pushButton_7_clicked();void on_pushButton_8_clicked();void on_pushButton_9_clicked();void on_pushButton_AD_clicked();void on_pushButton_SU_clicked();void on_pushButton_MU_clicked();void on_pushButton_DV_clicked();void on_pushButton_EQ_clicked();void on_pushButton_BS_clicked();void on_pushButton_CL_clicked();void on_pushButton_AS_clicked();private:Ui::Widget *ui;long long num1, num2;bool flag;char sign;
};
#endif // WIDGET_H

widget.cpp

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent): QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);ui->lineEdit->setText("0");num1 = num2 = 0;flag = false;
}Widget::~Widget()
{delete ui;
}void Widget::setNum(int i)
{if(flag == false){num1 = num1 * 10 + i;ui->lineEdit->setText(QString::number(num1));}else{num2 = num2 * 10 + i;ui->lineEdit->setText(QString::number(num2));}
}void Widget::on_pushButton_0_clicked(){setNum(0);}
void Widget::on_pushButton_1_clicked(){setNum(1);}
void Widget::on_pushButton_2_clicked(){setNum(2);}
void Widget::on_pushButton_3_clicked(){setNum(3);}
void Widget::on_pushButton_4_clicked(){setNum(4);}
void Widget::on_pushButton_5_clicked(){setNum(5);}
void Widget::on_pushButton_6_clicked(){setNum(6);}
void Widget::on_pushButton_7_clicked(){setNum(7);}
void Widget::on_pushButton_8_clicked(){setNum(8);}
void Widget::on_pushButton_9_clicked(){setNum(9);}void Widget::on_pushButton_AD_clicked(){ui->lineEdit->setText("0");flag = true; sign = '+'; num2 = 0;}
void Widget::on_pushButton_SU_clicked(){ui->lineEdit->setText("0");flag = true; sign = '-'; num2 = 0;}
void Widget::on_pushButton_MU_clicked(){ui->lineEdit->setText("0");flag = true; sign = '*'; num2 = 0;}
void Widget::on_pushButton_DV_clicked(){ui->lineEdit->setText("0");flag = true; sign = '/'; num2 = 0;}void Widget::on_pushButton_EQ_clicked()
{switch(sign){case '+':num1 += num2; ui->lineEdit->setText(QString::number(num1)); flag = false; break;case '-':num1 -= num2; ui->lineEdit->setText(QString::number(num1)); flag = false; break;case '*':num1 *= num2; ui->lineEdit->setText(QString::number(num1)); flag = false; break;case '/':num1 /= num2; ui->lineEdit->setText(QString::number(num1)); flag = false; break;}
}void Widget::on_pushButton_BS_clicked()
{if(flag){num2 /= 10;ui->lineEdit->setText(QString::number(num2));}else{num1 /= 10;ui->lineEdit->setText(QString::number(num1));}
}void Widget::on_pushButton_CL_clicked()
{num1 = 0;num2 = 0;flag = false;ui->lineEdit->setText("0");
}void Widget::on_pushButton_AS_clicked()
{if(flag){num2 = -num2;ui->lineEdit->setText(QString::number(num2));}else{num1 = -num1;ui->lineEdit->setText(QString::number(num1));}
}