1、概述
源码放在文章末尾

该项目实现了用于存款和贷款的计算器的功能，如下图所示：

项目部分代码如下：

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>namespace Ui {
class Widget;
}class Widget : public QWidget
{Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();private:Ui::Widget *ui;private slots:void initForm();void on_btnCalc_clicked();void on_btnCalc2_clicked();
};#endif // WIDGET_H

#pragma execution_character_set("utf-8")#include "widget.h"
#include "ui_widget.h"
#include "qmessagebox.h"
#include "qdebug.h"Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget)
{ui->setupUi(this);this->initForm();
}Widget::~Widget()
{delete ui;
}void Widget::initForm()
{QDateTime now = QDateTime::currentDateTime();ui->dateStart->setDate(now.date());ui->dateEnd->setDate(now.date().addYears(1));
}void Widget::on_btnCalc_clicked()
{//当前多少钱int moneyCurrent = ui->txtMoneyCurrent->text().toInt();//利息float rate = ui->txtRate->text().toFloat();//定期期限int year = ui->cboxYear->currentText().left(1).toInt();//总年份 必须是定期期限的倍数int years = ui->txtYears->text().toInt();//最终多少钱int moneyAll = 0;if (years % year != 0) {ui->txtYears->setFocus();QMessageBox::critical(this, "错误", "总年份必须是期限的整数倍数!");return;}if (ui->cboxType->currentIndex() == 0) {//傻瓜场景 直接计算moneyAll = moneyCurrent + (moneyCurrent * rate * years);} else {//真实场景 复利计算int count = years / year;for (int i = 0; i < count; ++i) {moneyCurrent = moneyCurrent + (moneyCurrent * rate * year);}moneyAll = moneyCurrent;}//计算下来3年期定期存款30年总金额翻2番到最初本金3倍 100W本金3年期自动续期30年=321WQString value = QString::number(moneyAll);ui->txtMoneyAll->setText(value);//拷贝到其他地方if (ui->rbtn1->isChecked()) {ui->txtValue1->setText(value);} else {ui->txtValue2->setText(value);}//计算两种存款方式的差额 比如1年期存3年和3年期存3年QString value1 = ui->txtValue1->text().trimmed();QString value2 = ui->txtValue2->text().trimmed();if (!value1.isEmpty() && !value2.isEmpty()) {int value = qAbs(value1.toInt() - value2.toInt());ui->txtValue->setText(QString::number(value));}
}void Widget::on_btnCalc2_clicked()
{//计算天数QDateTime dateStart = ui->dateStart->dateTime();QDateTime dateEnd = ui->dateEnd->dateTime();int day = dateStart.daysTo(dateEnd);int money = ui->txtMoney2->text().toInt();float rate = ui->txtRate2->text().toFloat();int result = money * rate * day;ui->txtResult2->setText(QString::number(result));qDebug() << day;
}

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