c program to find the factorial of n numbers

#include<stdio.h>
void main() 
{ 
    int num,i,f=1; 
    clrscr(); 
    printf("Enter the a Num : "); 
    scanf("%d",&num); 
    for(i=num;i>=1;i--) 
    { 
        f=f*i; 
    } 
    printf("%d",f); 
    getch(); 
}
                                

Enter the a Num : 5 
120