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Program to Calculate Factorial of a Number Using Recursion in C

This program takes a positive integer from user and calculates the factorial of that number. Instead of loops to calculate factorial, this program uses recursive function to calculate the factorial of a number.
/* Source code to find factorial of a number. */

int factorial(int n);
int main()
    int n;
    printf("Enter an positive integer: ");
    printf("Factorial of %d = %ld", n, factorial(n));
    return 0;
int factorial(int n)
     return n*factorial(n-1);
Enter an positive integer: 5
Factorial of 5 = 120