C# 值始终为 0 控制台应用程序

Question

我不知道为什么我的 BMI 值总是 = 0。我是编程新手，我错过了什么？除此之外，我的 if 语句还好吗？我错过了什么？

    static void Main(string[] args) {
        double WeightKg = 0.0, HeightCm = 0.0, Weightlbs = 0.0, WeightOz = 0.0, BMI = 0.0, Feet = 0.0, Inches = 0.0;
        int BMIOption;
        string AnotherConversion;

        string BMIMenu = ("Which Measurement You Want to use to enter the weight and height?"
                        + "\n1)Enter 1 for Metric"
                        + "\n2)Enter 2 for British Imperial:");
        Console.Write(BMIMenu);
        BMIOption = int.Parse(Console.ReadLine());

        if (BMIOption == 1) {
            Console.Write("\nPlease Enter your Weight in Kilogram (kg):");
            WeightKg = int.Parse(Console.ReadLine());
            Console.Write("\nPlease Enter your Height in in centimetres (cm):");
            HeightCm = int.Parse(Console.ReadLine());

            BMI = WeightKg / (HeightCm * HeightCm);

            if (BMI >= 35) {
                Console.WriteLine("\nYour BMI is {0:C},Severe Obesity", BMI);
            } else if (BMI >= 30) {
                Console.WriteLine("\nYour BMI is {0:C},Obese", BMI);
            } else if (BMI >= 25) {
                Console.WriteLine("\nYour BMI is {0:C},OverWeight", BMI);
            } else if (BMI >= 18.5) {
                Console.WriteLine("\nYour BMI is {0:C},Healthy BodyWeight", BMI);
            } else if (BMI <= 18.5) {
                Console.WriteLine("\nYour BMI is {0:C},UnderWeight", BMI);
            }//End if

            Console.Write("\nWould you like to make an another conversion? \n\n(Enter Y to make an another conversion/Enter any other key to exit):");

            Console.ReadKey();

Answer 1

BMI 的计算单位是米，而不是厘米。因此，您需要将 HeightCm 转换为 HeightM。如果你不这样做，你会得到非常小的数字，然后打印为 0。

double HeightM = HeightCm / 100.0;
BMI = WeightKg / (HeightM * HeightM);

此外，在解析时，使用 double.Parse 而不是 int.Parse。现在的方式是，您将只解析没有小数部分的数字。