WRITE A FUNCTION TO CALCULATE FACTORIAL OF A NUMBER

#include<conio.h>
#include<stdio.h>
void main()
{
int fact(int);
int n,r;
clrscr();
printf("enter the number\n");
scanf("%d",&n);
r=fact(n);
printf(" %d! is %d",n,r);
getch();
}

int fact(int n)
{
int f=1,i;
for(i=1;i<=n;i++)
f=f*i;
return f;
}