大佬们 这个程序问题出在哪？ 它会直接退出循环

//power.c--计算数的整数幂
#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_s("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!\b");

    return 0;
}

double power(double n, int p)
{
    double pow = 1.0;
    int i;

    for (i = 1; i <= p; i++)
        pow *= n;
    return pow;
}