Program to find factorial of a number using recursive function.

#include<stdio.h>

int factorial(int n);

int main()
{
    int n,f;
    printf("Enter an positive integer: ");
    scanf("%d",&n);
    f=factorial(n);
    printf("Factorial of %d = %d", n,f );
    return 0;
}

int factorial(int n)

{
    if(n!=1)
     return (n*factorial(n-1));
}

Output:

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