不用数组输出一个数的逆序，这个程序问题所在

//逆序输出一个数

#include <stdio.h>
#include <stdlib.h>
#include <math.h>
int reverse(int number);
int main()
{
    int number;
    printf("Please input a number: ");
    scanf("%d",&number);
    int new_number = reverse(number);
    printf("%d\n",new_number);
    system("pause");
    return 0;
}

int reverse(int number)
{
    int number_new = 0;
    int size_of_number = 0;
    int temp = number;
    while (temp / 10)
    {
        size_of_number++;
        temp /= 10;
    }
    for (int i = 1,j = size_of_number; i <= size_of_number, j >= 1; i++, j--)
    {
        number_new += (int)pow((double) 10,i-1)*(number % (int)pow((double)10,j));  
        number -= (int)pow((double)10,j) * (number % (int)pow((double)10,j));
    }
    return number_new;
}