如果声明

Question

你好，我正在用C＃编写一个程序，该程序需要一个数字并要求用户输入数字，一旦用户输入了数字，程序就会检查它是否与原始数字匹配，如果不匹配，则应该告诉用户是否答案小于或大于，但是我的if语句不起作用。

        //Boolean if user passes
        Boolean Userpassed;
        // Declares Answer Variable
        int answer = 6;
        // Asks user for a number
        Console.WriteLine("Enter a number between 1 and 10");
        // Displays Message
        Console.ReadLine();
        // Takes User Input as String
        string useranswer = Console.ReadLine();
        // Declares integer for actual integer
        int userinput;
        // User string parsed to Int
        userinput = Convert.ToInt32(Console.Read());
        // Displays Message
        Console.ReadLine();
        // Checks if input is equal to answer
        if (userinput == answer)
        {
            // User passes
            Console.WriteLine("Congratulations, you have passed");

        }
        // Checks if input is greater than answer
        else if (userinput > answer)
        {
            // User Fails
            Console.WriteLine("The actual answer is less than what you entered");
        }
        // Checks if input is less than answer
        else if (userinput < answer)
        {
            // User Fails
            Console.WriteLine("The actual answer is greater than what you entered");
        }
        // Displays Message
        Console.ReadLine();

第一个if语句不起作用，因为当我输入6时，它只是传递给else循环。然后，如果输入其他数字，则不会超过第二个else循环。我该如何解决这个问题？

Answer 1

您必须Parse输入行而不是Convert输入单个字符，即代替

 Console.WriteLine("Enter a number between 1 and 10");
 // Displays Message
 // Console.ReadLine();       <== Remove this line
 // Takes User Input as String
 string useranswer = Console.ReadLine();
 // Declares integer for actual integer
 int userinput;
 // User string parsed to Int
 userinput = Convert.ToInt32(useranswer);

您应该输入以下内容：

 int userinput = 0;

 // Keep on asking until valid input provided - an integer number in [1..10] range
 while (true) {
   Console.WriteLine("Enter a number between 1 and 10");

   if (!int.TryParse(Console.ReadLine(), out userinput))
     Console.WriteLine("Sorry, syntax error; try again");
   else if (userinput < 0)
     Console.WriteLine("Your input less than 0; try again");  
   else if (userinput > 10)
     Console.WriteLine("Your input greater than 10; try again");  
   else
     break; // <- Valid input
 } 

Answer 2

您输入的Console.ReadLine();超出了您的需求

通过不对代码进行更多更改

 // Boolean if user passes
 Boolean Userpassed;
 // Declares Answer Variable
 int answer = 6;
 // Asks user for a number
 Console.WriteLine("Enter a number between 1 and 10");
 // Displays Message
 // Console.ReadLine();       <== Remove this line
 // Takes User Input as String
 string useranswer = Console.ReadLine();
 // Declares integer for actual integer
 int userinput;
 // User string parsed to Int
 userinput = Convert.ToInt32(useranswer);       //<== pass useranswer to here
 // Displays Message
 // Console.ReadLine();    <== Remove this line
 // Checks if input is equal to answer

 //your rest code is same here

Answer 3

别担心，你会学到这些东西

int ans = 6;
Console.WriteLine("Enter a number between 1 and 10");
//taking integer input from user
int input = Convert.ToInt32(Console.ReadLine());
//now checking user input with selected answere
if(ans == input)//true, when user predicts correct number
{
    Console.WriteLine("Congratulations!!!");
}
else if(input < ans)//true, when user predicted number < actual number
{
    Console.WriteLine("The actual answer is less than what you entered");
}
else//true, when both above conditions are false
{
    Console.WriteLine("The actual answer is greater than what you entered");
}