jsq.rar_Qt4计算器_qt 计算器

#include<cacu.h> #include<qfont.h> window::window( ) { resize(300,300); //重画窗口大小 A="0"; B="0"; c=' '; //初始化。注意c初始化为空格键 l=new QLineEdit(this); l->setText(B); l->setReadOnly(true); //添加文本编辑框并且设置为不可更改 b1=new QPushButton("1",this); b2=new QPushButton("2",this); b3=new QPushButton("3",this); b4=new QPushButton("4",this); b5=new QPushButton("5",this); b6=new QPushButton("6",this); b7=new QPushButton("7",this); b8=new QPushButton("8",this); b9=new QPushButton("9",this); b0=new QPushButton("0",this); bchen=new QPushButton("*",this); bchu=new QPushButton("/",this); bjia=new QPushButton("+",this); bjian=new QPushButton("-",this); b=new QPushButton(".",this); bden=new QPushButton("=",this); binit=new QPushButton("Init",this); ll=new QLabel("Caculator",this); //为各个部件申请空间 QFont f=QFont("Times",18,QFont::Bold); //设置QLabel的格式 ll->setFont(f); //应用格式 /********以上处理各个部件在主窗口中的位置***********/ l->setGeometry(20,10,250,60); b1->setGeometry(20,90,30,30); b2->setGeometry(70,90,30,30); b3->setGeometry(120,90,30,30); b4->setGeometry(170,90,30,30); b5->setGeometry(220,90,30,30); b6->setGeometry(20,150,30,30); b7->setGeometry(70,150,30,30); b8->setGeometry(120,150,30,30); b9->setGeometry(170,150,30,30); b0->setGeometry(220,150,30,30); bchen->setGeometry(20,210,30,30); bchu->setGeometry(70,210,30,30); bjia->setGeometry(120,210,30,30); bjian->setGeometry(170,210,30,30); b->setGeometry(220,210,30,30); bden->setGeometry(20,270,30,30); binit->setGeometry(70,270,30,30); ll->setGeometry(120,265,200,40); /*******以上连接各个按键和对应的槽****************/ connect(b1,SIGNAL(clicked()),this,SLOT(B1())); connect(b2,SIGNAL(clicked()),this,SLOT(B2())); connect(b3,SIGNAL(clicked()),this,SLOT(B3())); connect(b4,SIGNAL(clicked()),this,SLOT(B4())); connect(b5,SIGNAL(clicked()),this,SLOT(B5())); connect(b6,SIGNAL(clicked()),this,SLOT(B6())); connect(b7,SIGNAL(clicked()),this,SLOT(B7())); connect(b8,SIGNAL(clicked()),this,SLOT(B8())); connect(b9,SIGNAL(clicked()),this,SLOT(B9())); connect(b0,SIGNAL(clicked()),this,SLOT(B0())); connect(bjia,SIGNAL(clicked()),this,SLOT(Badd())); connect(bjian,SIGNAL(clicked()),this,SLOT(Bdel())); connect(bchen,SIGNAL(clicked()),this,SLOT(Bmul())); connect(bchu,SIGNAL(clicked()),this,SLOT(Bdiv())); connect(b,SIGNAL(clicked()),this,SLOT(Bpoi())); connect(bden,SIGNAL(clicked()),this,SLOT(Bden())); connect(binit,SIGNAL(clicked()),this,SLOT(Binit())); } /********以下为各个槽函数详细内容********/ void window::B1() //数字按键“1”的槽函数 { if(B=="0") B="1"; //如果B为0直接进行替代，想象下计算器，按了“1”键总不能显示的是“01”吧.. else { B=l->text(); //如果不是，先获取当前文本编辑框的内容，如B=23，再按一下那么在后面追加1.. B.append('1'); } l->setText(B); //将B再次送到文本编辑框进行显示... } void window::B2() //同上 { if(B=="0") B="2"; else { B=l->text(); B.append('2'); } l->setText(B); } void window::B3() //同上.. { if(B=="0") B="3"; else { B=l->text(); B.append('3'); } l->setText(B); } void window::B4() { if(B=="0") B="4"; else { B=l->text(); B.append('4'); } l->setText(B); } void window::B5() { if(B=="0") B="5"; else { B=l->text(); B.append('5'); } l->setText(B); } void window::B6() { if(B=="0") B="6"; else { B=l->text(); B.append('6'); } l->setText(B); } void window::B7() { if(B=="0") B="7"; else { B=l->text(); B.append('7'); } l->setText(B); } void window::B8() { if(B=="0") B="8"; else { B=l->text(); B.append('8'); } l->setText(B); } void window::B9() { if(B=="0") B="9"; else { B=l->text(); B.append('9'); } l->setText(B); } void window::B0() { if(B=="0") B="0"; else { B=l->text(); B.append('0'); } l->setText(B); } void window::Bpoi() //这个是小数点键对应的slot函数，比较特殊，直接追加就可以了 { if(B=="0") B.append('.'); else { B=l->text(); B.append('.'); } l->setText(B); } void window::Badd() //加法键 { double n,m; B=l->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B复制给A(注意A原来是“0”) //同时保存这一次的操作符，以便下一次计算. { A=B; B="0"; c='+'; } else { n=A.toDouble(); //如果上一次已经有运算符，那么将A,B都转换成浮点数 m=B.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 A=QString::number(n,'f',10); //再转换回字符形式 B="0"; //将B重新初始化 c='+'; l->setText(A); //显示中间结果 } } void window::Bdel() //同上 { double n,m; B=l->text(); if(c==' ') { A=B; B="0"; c='-'; } else { n=A.toDouble(); m=B.toDouble(); if(c=='+') n=n+m; if(c=='-') n=n-m; if(c=='*') n=n*m; if(c=='/') n=n/m; A=QString::number(n,'f',10); B="0"; c='-'; l->setText(A); } } void window::Bmul() //乘号 { double n,m; B=l->text(); if(c==' ') { A=B; B="0"; c='*'; } else { n=A.toDouble(); m=B.toDouble(); if(c=='+') n=n+m; if(c=='-') n=n-m; if(c=='*') n=n*m; if(c=='/') n=n/m; A=QString::number(n,'f',10); B="0"; c='*'; l->setText(A); } } void window::Bdiv() //除号 { double n,m; B=l->text(); if(c==' ') { A=B; B="0"; c='/'; } else { n=A.toDouble(); m=B.toDouble(); if(c=='+') n=n+m; if(c=='-') n=n-m; if(c=='*') n=n*m; if(c=='/') n=n/m; A=QString::number(n,'f',10); B="0"; l->setText(A); } } void window::Bden() //等号键，同上类似 { double n,m; B=l->text(); if(c==' ') { A=B; B="0"; l->setText(A); A="0"; c=' '; } else { n=A.toDouble(); m=B.toDouble(); if(c=='+') n=n+m; if(c=='-') n=n-m; if(c=='*') n=n*m; if(c=='/') n=n/m; A=QString::number(n,'f',10); B="0"; c=' '; l->setText(A); A="0"; } } void window::Binit() //按了Init键，所有都初始化 { A="0"; B="0"; c=' '; l->setText(B); }