Recursive exponent

#include <stdio.h>
double power(double n, int p);
int main(void){
    double x, xpow;
    int exp;

    printf("Enter a number and the positive integer power");
    printf(" to which\nthe number will be raised. Enter q");
    printf(" to quit.\n");
    while(scanf("%lf%d", &x, &exp)==2){
        xpow=power(x, exp);
        printf("%.3g to the power %d is %.5g\n", x, exp, xpow);
        printf("Enter next pair of numbers or q to quit.\n");
    }

    printf("Hope you enjoyed this power trip...bye!\n");

    return 0;
}

double power(double n, int p){
    double pow=1;
    int i=(p<0)?-p:p;
    if (n==0){
        return 0;
    }
    else if (p==0){
        return 1;
    }
    else{
        if(i>0)
            pow=n*power(n, i-1);
    }

    if(p<0)
        return 1/pow;
    else
        return pow;
}