问题标题: heOS计算器主要代码

整个heOS都基于QT(C++框架）编写

下面是项目中的can.cpp(计算器核心）:

#include "can.h"
#include "ui_can.h"
#include<windows.h>
can::can(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::can)
{
    ui->setupUi(this);
}

can::~can()
{
    //setWindowOpacity(0.8);
    delete ui;
}
int a,b,cnt=0,t1;
char tp;
QString mv="";
int getd(int lft)
{
    return (mv.left(lft)).toInt();
}
int de(int a,int b,char tp)
{
    switch (tp) {
    case '+':
        return a+b;
        break;
    case '-':
        return a-b;
        break;
    case '*':
        return a*b;
        break;
    case '/':
        return a/b;
        break;
    default:
        break;
    }
    return 0;
}

void can::on_toolButton_clicked()
{
    mv+='1';cnt++;
    ui->label->setText(mv);
}
void can::on_toolButton_2_clicked()
{
    mv+='2';cnt++;
    ui->label->setText(mv);
}
void can::on_toolButton_3_clicked()
{
    mv+='3';cnt++;
    ui->label->setText(mv);
}
void can::on_toolButton_4_clicked()
{
    mv+='4';cnt++;
    ui->label->setText(mv);
}
void can::on_toolButton_5_clicked()
{
    mv+='5';cnt++;
    ui->label->setText(mv);
}
void can::on_toolButton_6_clicked()
{
    mv+='6';cnt++;
}
void can::on_toolButton_7_clicked()
{
    mv+='7';cnt++;
    ui->label->setText(mv);
}
void can::on_toolButton_8_clicked()
{
    mv+='8';cnt++;
    ui->label->setText(mv);
}
void can::on_toolButton_9_clicked()
{
    mv+='9';cnt++;
    ui->label->setText(mv);
}
void can::on_toolButton_10_clicked()
{
    if(cnt==0)return;
    mv+='0';
    ui->label->setText(mv);
}
void can::on_toolButton_add_clicked()
{
    mv+='+';
    tp='+';
    ui->label->setText(mv);
    t1=mv.length();
    a=getd(mv.length()-1);
}
void can::on_toolButton_rem_clicked()
{
    mv+='-';
    tp='-';
    ui->label->setText(mv);
    t1=mv.length();
    a=getd(mv.length()-1);
}
void can::on_toolButton_che_clicked()
{
    mv+='*';
    tp='*';
    ui->label->setText(mv);
    t1=mv.length();
    a=getd(mv.length()-1);
}
void can::on_toolButton_chu_clicked()
{
    mv+='/';
    tp='/';
    ui->label->setText(mv);
    t1=mv.length();
    a=getd(mv.length()-1);
}
void can::on_toolButton_dy_clicked()
{
    int ans;
    b=mv.section(tp,1,1).toInt();
    ans=de(a,b,tp);
    ui->label->setText(QString::number(ans));
    mv="";
}
void can::on_pushButtondll_clicked()
{
    mv="";
    ui->label->setText(mv);
}
void can::on_pushButtonbk_clicked()
{
    mv=mv.chopped(1);
    ui->label->setText(mv);
}

把用户的输入转成QString(跟string差不多），再分析，最后得出结果