本文介绍了这必须是数值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述



我希望如果我写一个字符串就会出错。我怎么能写这个代码只取一个数值。



Hi,
I want that if I write a string that it gives an error. How can I write that this code only take a numeric value.

//This must be a numeric value

           Console.Write("Geef je startsalaris in: ");
           salaris = Convert.ToDouble(Console.ReadLine());
           while(//here should i say that if the user gives a string it will give this error)
           {
               Console.WriteLine("dit is geen numeriek waarde");
               Console.Write("Geef je startsalaris in: ");
               salaris = Convert.ToDouble(Console.ReadLine());
           }





我的尝试:



i尝试了很多东西,但没有任何解决方案。



What I have tried:

i have tried many things but without any solution.

推荐答案

Console.Write("Geef je startsalaris in: ");
while(!double.TryParse(Console.ReadLine(), out salaris))
{
    Console.WriteLine("dit is geen numeriek waarde");
    Console.Write("Geef je startsalaris in: ");
}


double x = 0.0;
bool flag = true;

Console.WriteLine("Enter value : ");

while (flag)
{
    try
    {
        x = Convert.ToDouble(Console.ReadLine());
        flag = false;
    }
    catch (Exception ex)
    {
        Console.WriteLine("Enter correct value :");
        flag = true;
    }
}

Console.WriteLine("ok :" + x);


这篇关于这必须是数值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

10-22 22:45