Error says that it can't transform string into int

Question

      string num;
            num = Console.ReadLine();
            Console.WriteLine(num);
            switch (num)
            {case 1:
            Console.WriteLine(one);

I'm trying to do a c# project where you type a number from 1 to 100 and you see the wrote version of it.

The error is telling you the truth. Strings need to be parsed into Numeric values. int.Parse() is the droid you are looking for. — Christopher, Dec 07 '19 at 17:52

score 1 · Answer 1 · answered Dec 07 '19 at 17:53

The variable num is a string. But you're trying to compare it with an integer here:

case 1:

The quickest solution would be to compare it with a string:

case "1":

Alternatively, and possibly as a learning experience for you, you may want to try converting num to an int. Take a look at int.TryParse for that. An example might look like this:

string num = Console.ReadLine();
int numValue = 0;
if (!int.TryParse(num, out numValue)) {
    // The value entered was not an integer.  Perhaps show the user an error message?
}

score -1 · Answer 2 · answered Dec 07 '19 at 18:13

You mentioned only wanting to print numbers between 1 and 100. This version does that.

var consoleResponse = Console.ReadLine();

if (int.TryParse(consoleResponse, out int parsedValue) 
        && parsedValue >= 1 
        && parsedValue <= 100) {
    Console.WriteLine(parsedValue);
}

Error says that it can't transform string into int

2 Answers2