I made a program to calculate factorial of the given number.

Question

But when I enter 20 or greater, it shows negative value . Please tell me where I am missing.
This is the code... (The main code)

int factorial = 1;
Console.Write("Enter the no. : ");
int num =
Convert.ToInt32(Console.ReadLine());

for(int x=1;x<=num;x++){
factorial *= x;
}
Console.WriteLine(

Answer 1

integer is not big enough, so this overflow.
Make it a double or a long or even bigger data type.

https://stackoverflow.com/questions/19230573/cannot-calculate-factorials-bigger-than-20-how-to-do-so

Answer 2

Thanks buddy