基于C++实现BMI身体质量指数计算工具

#include <iostream>
using namespace std;

double calculateBMI(double weight, double height) {
    // 身高单位为米，体重单位为千克
    double bmi = weight / (height * height);
    return bmi;
}

void interpretBMI(double bmi) {
    if (bmi < 18.5) {
        cout << "体重过轻" << endl;
    } else if (bmi >= 18.5 && bmi < 24) {
        cout << "正常范围" << endl;
    } else if (bmi >= 24 && bmi < 28) {
        cout << "体重过重" << endl;
    } else if (bmi >= 28 && bmi < 32) {
        cout << "肥胖" << endl;
    } else {
        cout << "非常肥胖" << endl;
    }
}

int main() {
    double weight, height;
    
    cout << "请输入体重（千克）：";
    cin >> weight;
    
    cout << "请输入身高（米）：";
    cin >> height;
    
    double bmi = calculateBMI(weight, height);
    
    cout << "你的BMI指数为：" << bmi << endl;
    
    interpretBMI(bmi);
    
    return 0;
}

// mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QDebug>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    /**
     * @brief on_pb_calculate_clicked
     * 自动创建的信号槽
     */
    void on_pb_calculate_clicked();

    /**
     * @brief printBMI
     * 手动创建的信号槽
     */
    void printBMI();

    /**
     * @brief calculateBMI
     * @param weight
     * @param height
     * @return double
     */
    double calculateBMI(double weight, double height);

    /**
     * @brief interpretBMI
     * @param bmi
     */
    void interpretBMI(double bmi);

private:
    Ui::MainWindow *ui;

    double weight, height;
};

#endif // MAINWINDOW_H

// mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    qDebug() << "start...";

    /* 终端输出计算值 */
    double mybmi = calculateBMI(80, 1.73);

    qDebug() << "terminal print: " << mybmi;

    connect(ui->pb_calculate_2, SIGNAL(clicked()), this, SLOT(printBMI()));
}

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

void MainWindow::on_pb_calculate_clicked()
{
    QString text = "Hello, BMI Tool! Auto created!";
    ui->tb_display->append(text);

    weight = ui->le_weight->text().toDouble();
    height = ui->le_height->text().toDouble();

    double bmi = weight / (height * height);
    QString strBMI = QVariant(bmi).toString();
    ui->tb_display->append(strBMI);

    interpretBMI(bmi);
}

void MainWindow::printBMI()
{
    QString text = "Hello, BMI Tool! Manual created!";
    ui->tb_display->append(text);

    weight = ui->le_weight->text().toDouble();
    height = ui->le_height->text().toDouble();

    double bmi = calculateBMI(weight, height);
    QString strBMI = QVariant(bmi).toString();
    ui->tb_display->append(strBMI);

    interpretBMI(bmi);
}

double MainWindow::calculateBMI(double weight, double height)
{
    double bmi = weight / (height * height);
    return bmi;
}

void MainWindow::interpretBMI(double bmi)
{
    if (bmi < 18.5) {
        ui->tb_display->append("体重过轻");
    } else if (bmi >= 18.5 && bmi < 24) {
        ui->tb_display->append("正常范围");
    } else if (bmi >= 24 && bmi < 28) {
        ui->tb_display->append("体重过重");
    } else if (bmi >= 28 && bmi < 32) {
        ui->tb_display->append("肥胖");
    } else {
        ui->tb_display->append("非常肥胖");
    }
}