Write a program to calculate factorial of a given number.

#include<stdio.h>
#include<conio.h>

void main()
{
    int i,b=1,n;
    printf("enter the number:");
    scanf("%d",&n);
    for(i=1;i<=n;i++)
        b=b*i;
    printf("factorial number is:%d",b);
    getch();
}