Question

我正在学习如何编程，所以请保持愉快。：）

运行代码时出现此错误：

发生了'System.FormatException'类型的未处理异常 mscorlib.dll其他信息：输入字符串不正确格式。

当我输入“拧你，不要告诉我该做什么！”。当我删除代码的整个侮辱部分时，它的工作完美无瑕。我做错了什么？

namespace ConsoleApplication6 
{
    class Program
    {
        static void Main(string[] args)
        {
            int numero1 = 5; //Declaring first variable
            int numero2 = 5; //Declaring second variable

            Console.WriteLine ("What is the answer of " + numero1 + " x " + numero2); //Asking question to the user

            int answer = Convert.ToInt32(Console.ReadLine()); //Converting the "answer" to integral variable
            string insult = Console.ReadLine(); //The user enter his insult          

            if (answer == 25) //If the answer is 25
            {
                Console.WriteLine("Good answer!"); //This message appears            
            }
            else if (insult == "screw you, don't tell me what to do!") //If the user insult me
            {
                Console.WriteLine("Wow buddy, gotta check that language!"); //The user receives this message              
            }
            else
            {
                Console.WriteLine("Dude...what?"); //If the user write anything else, he gets this message
            }
            Console.ReadKey();
        }
    } 
}

Answer 1

这样做：

        int numero1 = 5; //Declaring first variable
        int numero2 = 5; //Declaring second variable

        Console.WriteLine ("What is the answer of " + numero1 + " x " + numero2); //Asking question to the user

        string answer = Console.ReadLine(); //Converting the "answer" to integral variable


        if (answer == "25") //If the answer is 25
        {
            Console.WriteLine("Good answer!"); //This message appears            
        }
        else if (answer == "screw you, don't tell me what to do!") //If the user insult me
        {
            Console.WriteLine("Wow buddy, gotta check that language!"); //The user receives this message              
        }
        else
        {
            Console.WriteLine("Dude...what?"); //If the user write anything else, he gets this message
        }
        Console.WriteLine("Press any key to close the application");
        Console.ReadKey();

这是一个简单的更改，可以让您的代码更容易理解。你已经＆＃34;硬编码＆＃34;结果如此，将25放在一个字符串中，不会使你的代码不那么好。

Answer 2

如下所示使用int.TryParse，如果用户输入非整数值，程序将失败

Console.WriteLine ("What is the answer of " + numero1 + " x " + numero2);
string keyboardInput = Console.ReadLine();
int answer;
while (!int.TryParse(keyboardInput, out answer)) {
    Console.WriteLine("Invalid input, try again.");
    keyboardInput = Console.ReadLine();
}
// now read the insult
string insult = Console.ReadLine();

因为您需要两个输入，您需要在输入答案后单击输入，然后再次输入insult并按Enter键

初学者代码，有些事情是不对的。 if和else if语句（C＃）

2 个答案: