为什么不行呢

#include <stdio.h>

double taxi_price(int n,int time)

{

    double price;

    if(time >= 23 || time >= 0 && time <= 5 )

    {

        printf("price=%f",n<=3 ? price=13+1+n*(1+0.2)*2.3 : price=n*2.3*(1+0.2)+1);

    }

    else

    {

        printf("price=%f",n<=3 ? price=13+1 : price=n*2.3+1);

    }

}

int main()

{

    printf("price=%f",price=taxi_price(12,9)+taxi_price(12,21));

    return 0;

}