C Language - calculate a power b

. WAP to calculate a power b.

#include<stdio.h>
#include<conio.h>
void main()
{
    int a, b, i;
    long r=1;
    printf("Enter number: ");
    scanf("%d",&a);
    printf("Enter its power: ");
    scanf("%d",&b);
    for(i=1;i<=b;i++)
    {
        r=a*a;
    }
    printf("%d Power %d is %ld",a, b, r);
    getch();
}

Enter number: 2
Enter its power: 5
2 Power 5 is 32