To find factorial

#include<stdio.h>
#include<conio.h>
int main(void)
{
int i,num;
int res=1;
printf("Enter Number : \t");
scanf("%d",&num);
for(i=num; i>1; i--)
{
res*=i;
}
printf("\n\nFactorial of %d is : %d",num,res);
getch();
return 0;
}