QT初学者手动界面代码实现简单运算的计算器

这是用QT编写的只实现简单加减乘除运算的计算器，没有使用UI，界面纯手工。简单易懂，是初学者的良好引导者，程序完全可以运行成功。

#include “calc.h“
#include 
#include 
#include 

Calc::Calc（QWidget *parent）
    : QWidget（parent）
{
   operator1=“0“;
   operator2=“0“;
    i=0;

    setWindowtitle（“calculator“）;




            display=new QLineEdit（“0“）;
            display->setReadOnly（true）;
            display->setAlignment（Qt::AlignRight）;
            display->setMaxLength（300）;

            one=new QPushButton（“1“）;
            two=new QPushButton（“2“）;
            three=new QPushButton（“3“）;
            four=new QPushButton（“4“）;
            five=new QPushButton（“5“）;
            six=new QPushButton（“6“）;
            seven=new QPushButton（“7“）;
            eight=new QPushButton（“8“）;
            nine=new QPushButton（“9“）;
            zero=new QPushButton（“0“）;
            sub=new QPushButton（“-“）;
            mul=new QPushButton（“*“）;
            div=new QPushButton（“/“）;
            equal=new QPushButton（“=“）;
            add=new QPushButton（“+“）;
            point=new QPushButton（“.“）;
            clear=new QPushButton（“clear“）;
            backspace=new QPushButton（“backspace“）;



              connect（oneSIGNAL（clicked（））thisSLOT（oneClicked（）））;
              connect（twoSIGNAL（clicked（））thisSLOT（twoClicked（）））;
              connect（threeSIGNAL（clicked（））thisSLOT（threeClicked（）））;
              connect（fourSIGNAL（clicked（））thisSLOT（fourClicked（）））;
              connect（fiveSIGNAL（clicked（））thisSLOT（fiveClicked（）））;
              connect（sixSIGNAL（clicked（））thisSLOT（sixClicked（）））;
              connect（sevenSIGNAL（clicked（））thisSLOT（sevenClicked（）））;
              connect（eightSIGNAL（clicked（））thisSLOT（eightClicked（）））;
              connect（nineSIGNAL（clicked（））thisSLOT（nineClicked（）））;
              connect（zeroSIGNAL（clicked（））thisSLOT（zeroClicked（）））;
              connect（subSIGNAL（clicked（））thisSLOT（subClicked（）））;
              connect（mulSIGNAL（clicked（））thisSLOT（mulClicked（）））;
              connect（divSIGNAL（clicked（））thisSLOT（divClicked（）））;
              connect（pointSIGNAL（clicked（））thisSLOT（pointClicked（）））;
              connect（equalSIGNAL（clicked（））thisSLOT（equalClicked（）））;
              connect（addSIGNAL（clicked（））thisSLOT（addClicked（）））;
              connect（clearSIGNAL（clicked（））thisSLOT（clearClicked（）））;
              connect（backspaceSIGNAL（clicked（））thisSLOT（backspaceClicked（）））;



             QVBoxLayout  *mainlayout=new QVBoxLayout（）;
             QVBoxLayout *toplayout=new QVBoxLayout;
             toplayout->addWidget（display）;
             QHBoxLayout *button1=new QHBoxLayout;
             button1->addWidget（one）;
             button1->addWidget（two）;
             button1->addWidget（three）;
             button1->addWidget（four）;

             QHBoxLayout *button2=new QHBoxLayout;
             button2->addWidget（five）;
             button2->addWidget（six）;
             button2->addWidget（seven）;
             button2->addWidget（eight）;

           

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件       9699  2013-10-09 13:29  calc\calc.cpp

     文件       1206  2013-10-08 16:53  calc\calc.h

     文件        319  2013-10-05 15:19  calc\calce.pro

     文件      17744  2013-10-13 12:43  calc\calce.pro.user

     文件        164  2013-10-05 15:48  calc\main.cpp

    ..AD...         0  2013-10-13 12:43  calc

----------- ---------  ---------- -----  ----

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