例2-10

#include<stdio.h>
#include<math.h>
int main(void)
{
    int i,n;
    double power;

    printf("Enter n:");
    scanf_s("%d",&n);
    for(i=0;i<=n;i++){
        power=powl(2,i);
        printf("pow(2,%d)=%.0f\n",i,power);
    }

    return 0;
}