How can I read user input from the console?

Question

I want to get a number from the user, and then multiply that number with Pi. my attempt at this is below. But a contains gibberish. For example, if I insert 22, then a contains 50. What am I doing wrong? I don't get any compiler errors.

double a,b; a = Console.Read(); b = a * Math.PI; Console.WriteLine(b); 

Answer 1

I'm not sure what your problem is (since you haven't told us), but I'm guessing at

a = Console.Read(); 

This will only read one character from your Console.

You can change your program to this. To make it more robust, accept more than 1 char input, and validate that the input is actually a number:

double a, b; Console.WriteLine("istenen sayıyı sonuna .00 koyarak yaz"); if (double.TryParse(Console.ReadLine(), out a)) {   b = a * Math.PI;   Console.WriteLine("Sonuç " + b);  } else {   //user gave an illegal input. Handle it here. }