int gcd(int a, int b)
{
if (a==0 && b==0) return -1;
if (b==0) return a;
return gcd(b,a%b);
}


int lcm (int a, int b)
{
return (int) (a*b)/gcd(a,b);
}

#include<stdio.h>

main()

{

int a, fact;



printf(" Enter any number: ");

scanf ("%d", &a);



fact=rec (a);

printf(" Factorial Value = %d", fact);



}


rec (int x)

{

int f;



if (x==1)

return (1);

else

f=x*rec(x-1);



return (f);

}

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