基于Qt界面设计的科学计算器

【实例简介】实现计算器的多功能计算，比如实现整数、小数点简单的加减乘除、也可以实现进制数的转换、也可以实现倒数、清零、复位等

【注意事项】

如果调试时报错【在注释中遇到意外的文件结束】，请将widget.cpp中的 中文注释 全部去掉 即可

【实例截图】

【核心代码】

#include "widget.h"
#include "ui_widget.h"
#include <math.h>
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->lEditPlay->setText("0");
    num = num1 = num2 = 0;
    f_point = f_num = false;
    op = 0;
    times = 1;
    QObject::connect(this,SIGNAL(NumClick(int)), this, SLOT(Counter(int)));
}

Widget::~Widget()
{
    delete ui;
}

void Widget::changeEvent(QEvent *e)
{
    QWidget::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

/*数值处理*/
void Widget::Counter(int i)
{
    if(!f_point)
    {
        if(!f_num)
        {
            num1 = num1 * 10   i;
            ui->lEditPlay->setText(QString::number(num1));
        }
        else
        {
            num2 = num2 * 10   i;
            ui->lEditPlay->setText(QString::number(num2));
        }
    }
    else
    {
        times *= 10;
        if(!f_num)
        {
            num1 = num1   i/times;
            ui->lEditPlay->setText(QString::number(num1));
        }
        else
        {
            num2 = num2   i/times;
            ui->lEditPlay->setText(QString::number(num2));
        }
    }
}

/*数字健按下*/
void Widget::on_Btn1_clicked()
{
    emit NumClick(1);
}

void Widget::on_Btn2_clicked()
{
    emit NumClick(2);
}

void Widget::on_Btn3_clicked()
{
    emit NumClick(3);
}

void Widget::on_Btn4_clicked()
{
    emit NumClick(4);
}

void Widget::on_Btn5_clicked()
{
    emit NumClick(5);
}

void Widget::on_Btn6_clicked()
{
    emit NumClick(6);
}

void Widget::on_Btn7_clicked()
{
    emit NumClick(7);
}

void Widget::on_Btn8_clicked()
{
    emit NumClick(8);
}

void Widget::on_Btn9_clicked()
{
    emit NumClick(9);
}

void Widget::on_Btn0_clicked()
{
    emit NumClick(0);
}


/*功能键按下*/
void Widget::on_BtnDev_clicked()
{
    op = '/';
    f_num = true;
    f_point = false;
    times = 1;
}

void Widget::on_BtnMul_clicked()
{
    op = '*';
    f_num = true;
    f_point = false;
    times = 1;
}

void Widget::on_BtnSub_clicked()
{
    op = '-';
    f_num = true;
    f_point = false;
    times = 1;
}

void Widget::on_BtnPlus_clicked()
{
    op = ' ';
    f_num = true;
    f_point = false;
    times = 1;
}

void Widget::on_Btn10_clicked()
{
    op = 's';
    f_num = true;
    f_point = true;
    times = 1;
}

/*输出结果*/
void Widget::on_BtnEql_clicked()
{
    switch(op)
    {
    case ' ':
        num = num1   num2;
        break;
    case '-':
        num = num1 - num2;
        break;
    case '*':
        num = num1 * num2;
        break;
    case '/':
        num = num1 / num2;
        break;
    case 's':
        num = sin(num1*(3.14/180));
        break;
    case 0:
        num = num1;
    }
    ui->lEditPlay->setText(QString::number(num));
    num1 = num;
    num2 = 0;
    op = 0;
    times = 1;
}

/*小数点按下*/
void Widget::on_BtnPoint_clicked()
{
    f_point = true;
}

/*清除键按下*/
void Widget::on_BtnC_clicked()
{
    ui->lEditPlay->setText("0");
    num1 = 0;
    num2 = 0;
    op = 0;
    f_point = f_num = false;
    times = 1;
}

void Widget::on_BtnBack_clicked()
{
    if(!f_num)
    {
  //      ui->lEditPlay->backspace();
        num1 = ui->lEditPlay->text().toDouble();
        ui->lEditPlay->setText(QString::number(num1));
    }
    else
    {
  //      ui->lEditPlay->backspace();
        num2 = ui->lEditPlay->text().toDouble();
        ui->lEditPlay->setText(QString::number(num2));
    }
}

void Widget::on_BtnCE_clicked()
{
    if(f_num)
    {
        num2 = 0;
        ui->lEditPlay->setText(QString::number(num2));
    }
    else if(op != 0)
        op = 0;
    else
    {
        num1 = 0;
        ui->lEditPlay->setText(QString::number(num1));
    }
}