当我输入体重和身高时，c＃bmi计算器NaN问题

Question

我输入体重和身高，最终得到了BMI的结果。感谢您对此问题的帮助和考虑

double height = 0.0;
double weight = 0.0;
double bmi = height / weight;
double bmi = height / weight;
Console.Write("Enter your height in m:");
height = Convert.ToDouble(Console.ReadLine());
Console.Write("Enter your weight in kg:");
weight = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("Your BMI is:{0}", Math.Round(bmi,4));
bmi = Convert.ToDouble(Console.ReadLine());
Console.ReadKey();

Answer 1

您在分配bmi和height之前计算weight。它们的初始值为0，因此您有一个被零除的情况，这导致NaN：

double height = 0.0;
double weight = 0.0;
double bmi = height / weight;

bmi没有自动更新。您需要首先分配height和weight ，然后计算bmi。

Console.Write("Enter your height in m:");
double height = Convert.ToDouble(Console.ReadLine());

Console.Write("Enter your weight in kg:");
double weight = Convert.ToDouble(Console.ReadLine());

double bmi = height / weight;
Console.WriteLine("Your BMI is:{0}", Math.Round(bmi,4));