![](/img/trans.png)
[英]Unhandled exception of type “System.FormatException” Input string was not in correct format
[英]after do… while loop Unhandled Exception: System.FormatException: Input string was not in a correct format
所以我的实验室应该问你想要多少问题,然后给你随机生成的数学问题。 最后,它应该会询问您是否想要另一组问题或只是结束,您可以选择回答 y 或 n。 当我停止代码时,一切正常,但我还需要正确打印总金额,当我添加该代码时,我得到未处理的异常。 我的问题来自括号前的最后三行:
using System;
class MainClass {
public static void Main (string[] args) {
var rnd = new Random();
string exit = "";
double score = 0;
double total = 0;
double percent = 0;
Console.WriteLine("How many problems do you want in a set?");
double problem = Convert.ToDouble(Console.ReadLine());
do{
for(double i = 1; i<=problem; i++){
double num1 = rnd.Next(1,9);
double num2 = rnd.Next(1,9);
Console.Write("Problem {0} : {1}*{2}=? ", i, num1, num2);
double answer = Convert.ToDouble(Console.ReadLine());
if(num1*num2 == answer){
score++;
}//end if
total++;
}
Console.Write("Another set? <y/n>");
exit = Console.ReadLine();
Console.ReadLine();
}while(exit!="n");
percent = score/total;
Console.WriteLine(" {} correct out of {} is a {}%",score,total,percent);
Console.WriteLine("done");
}//end main
}//end class
为参数 {0}、{1}、{2} 编号,或者您现在可以使用字符串插值,如下所示:
Console.WriteLine($"{score} correct out of {total} is a {percent}%");
Console.WriteLine(" {} correct out of {} is a {}%",score,total,percent);
需要 0、1 和 2
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.