Program in C For Series 2 4 8 16...... upto nth term

/* Program in C For Series 2 4 8 16...... upto nth term */
#include<stdio.h>
#include<conio.h>
void main()
{
    int a=2,i,num;
    printf("\n Enter any number :");
    scanf("%d",&num);
    for(i=1;i<=num;i++)
    {
    printf(" %d ",a);
    a=a*2;
    }
    getch();
}