1.using for
loop
#include
<stdio.h>
int main()
{
int c, n, fact = 1;
printf("Enter a number to calculate it's
factorial\n");
scanf("%d", &n);
for (c = 1; c <= n; c++)
fact = fact * c;
printf("Factorial of %d = %d\n", n,
fact);
return 0;
}
2. Using
function
#include
<stdio.h>
long
factorial(int);
int main()
{
int number;
long fact = 1;
printf("Enter a number to calculate it's
factorial\n");
scanf("%d", &number);
printf("%d! = %ld\n", number,
factorial(number));
return 0;
}
long
factorial(int n)
{
int c;
long result = 1;
for (c = 1; c <= n; c++)
result = result * c;
return result;
}