lesson_test_calculator_final.rar_Final Test

#include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { sum=""; ui->setupUi(this); connect(ui->pushButton_1,SIGNAL(clicked()),this,SLOT(clickNum1())); connect(ui->pushButton_2,SIGNAL(clicked()),this,SLOT(clickNum2())); connect(ui->pushButton_3,SIGNAL(clicked()),this,SLOT(clickNum3())); connect(ui->pushButton_4,SIGNAL(clicked()),this,SLOT(clickNum4())); connect(ui->pushButton_5,SIGNAL(clicked()),this,SLOT(clickNum5())); connect(ui->pushButton_6,SIGNAL(clicked()),this,SLOT(clickNum6())); connect(ui->pushButton_7,SIGNAL(clicked()),this,SLOT(clickNum7())); connect(ui->pushButton_8,SIGNAL(clicked()),this,SLOT(clickNum8())); connect(ui->pushButton_9,SIGNAL(clicked()),this,SLOT(clickNum9())); connect(ui->pushButton_0,SIGNAL(clicked()),this,SLOT(clickNum0())); connect(ui->pushButton_point,SIGNAL(clicked()),this,SLOT(clickPoint())); connect(ui->pushButton_lbracket,SIGNAL(clicked()),this,SLOT(clickLbracket())); connect(ui->pushButton_rbracket,SIGNAL(clicked()),this,SLOT(clickRbracket())); connect(ui->pushButton_clean,SIGNAL(clicked()),this,SLOT(clickClean())); connect(ui->pushButton_delete,SIGNAL(clicked()),this,SLOT(clickDelete())); connect(ui->pushButton_plus,SIGNAL(clicked()),this,SLOT(clickPlus())); connect(ui->pushButton_minus,SIGNAL(clicked()),this,SLOT(clickMinus())); connect(ui->pushButton_multi,SIGNAL(clicked()),this,SLOT(clickMulti())); connect(ui->pushButton_div,SIGNAL(clicked()),this,SLOT(clickDiv())); connect(ui->pushButton_equl,SIGNAL(clicked()),this,SLOT(clickEqul())); } void Widget::clickNum1()//按钮1的槽函数。 { QString num1="1"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickNum2()//按钮2的槽函数。 { QString num1="2"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickNum3()//按钮3的槽函数。 { QString num1="3"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickNum4()//按钮4的槽函数。 { QString num1="4"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickNum5()//按钮5的槽函数。 { QString num1="5"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickNum6()//按钮6的槽函数。 { QString num1="6"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickNum7()//按钮7的槽函数。 { QString num1="7"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickNum8()//按钮8的槽函数。 { QString num1="8"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickNum9()//按钮9的槽函数。 { QString num1="9"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickNum0()//按钮0的槽函数。 { QString num1="0"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickPoint()//按钮point的槽函数。 { QString num1="."; QString num2="0."; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num2); } else { ui->lineEdit->setText(str); } } void Widget::clickLbracket()//按钮lbracket的槽函数。 { QString num1="("; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickRbracket()//按钮rbracket的槽函数。 { QString num1=")"; QString str=ui->lineEdit->text(); str=str+num1; if(ui->lineEdit->text()=="0") { ui->lineEdit->setText(num1); } else { ui->lineEdit->setText(str); } } void Widget::clickClean()//按钮clean的槽函数。 { QString num1="0"; ui->lineEdit->setText(num1); } void Widget::clickDelete()//按钮delete的槽函数。 { QString a="0"; QString str=ui->lineEdit->text(); if(str.length()==1) { ui->lineEdit->setText(a); } else if(str.length()>1) { str=str.left(str.length()-1);//从左边取长度减去1的字符串。 ui->lineEdit->setText(str); } } void Widget::clickPlus()//按钮+的槽函数。 { QString num1="+"; QString str=ui->lineEdit->text(); sum=str+num1; ui->lineEdit->setText(sum); } void Widget::clickMinus()//按钮-的槽函数。 { QString num1="-"; QString str=ui->lineEdit->text(); sum=str+num1; ui->lineEdit->setText(sum); } void Widget::clickMulti()//按钮*的槽函数。 { QString num1="*"; QString str=ui->lineEdit->text(); sum=str+num1; ui->lineEdit->setText(sum); } void Widget::clickDiv()//按钮/的槽函数。 { QString num1="/"; QString str=ui->lineEdit->text(); sum=str+num1; ui->lineEdit->setText(sum); } void Widget::clickEqul()//按钮=的槽函数。 { QString str=ui->lineEdit->text(); QScriptEngine engine;//QScriptEngine类为程序提供一个嵌入式脚本环境,每一个引擎都是一个轻量级自包含的虚拟机。 QScriptValue result = engine.evaluate(str);//调用脚本引擎的evaluate()函数可以执行脚本，此处即可算出之前输入的字符串算式的结果。 ui->lineEdit->setText(result.toString());//调用QScriptValue类的toString()函数将QScriptValue类的执行结果转换成string型。 } Widget::~Widget() { delete ui; }