C language program to find out the factorial of an integer by calling a function.

#include<stdio.h>

void main()

{

          long int n;

          long int fact(long int n);

          clrscr();

          printf(" Enter a number: ");

          scanf("%ld",&n);

          printf(" Factorial of %ld is %ld",n,fact(n));

          getch();

}

long int fact(long int i)

{

          int fct=1;

          for(;i>=1;i--)

          fct*=i;

          return fct;

}