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#include <stdio.h>
int fact(int n)
{
if (n == 0)
return 1;
else
return n * fact(n - 1);
}
int main(void)
{
int n;
printf("To calculate the factorial of a given number\n\n");
printf("Enter a number: ");
scanf("%d", &n);
if (n < 0) {
printf("Invalid input, must be greater than -1\n");
return 0;
}
printf("%d! = %d\n", n, fact(n));
return 0;
}
/*
Output:
Set 1:
To calculate the factorial of a given number
Enter a number: -1
Invalid input, must be greater than zero
Set 2:
To calculate the factorial of a given number
Enter a number: 0
0! = 1
Set 3:
To calculate the factorial of a given number
Enter a number: 5
5! = 120
Set 4:
To calculate the factorial of a given number
Enter a number: 10
10! = 3628800
*/
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