浙大版《C语言程序设计（第3版）》题目集 习题6-6 使用函数输出一个整数的逆序数 (20分)

#include <stdio.h>
int reverse(int number);
int main()
{
    int n;
    scanf("%d", &n);
    printf("%d\n", reverse(n));
    return 0;
}
int reverse(int number)
{
    int a[20], n = 0, ret = 0, i, k = 1;
    while (number)
    {
        a[n++] = number % 10;
        number /= 10;
    }
    for (i = n - 1; i >= 0; i--)
    {
        ret += a[i] * k;
        k = k * 10;
    }
    return ret;
}