正序输出整数

1、

/*
    正序输出整数的每一位数，数字之间用空格隔开
    123456    1 2 3 4 5 6
*/

#include <stdio.h>
int pow(int a, int b);

int main()
{
    int n;

    scanf_s("%d", &n);

    //判断一个数有几位
    int count = 0;
    int temp = n;
    do
    {
        temp = temp / 10;
        count++;
    } while (temp!=0);

    //分离出每一位数
    int digit;
    temp = n;
    do
    {
        digit = temp / pow(10, count - 1);
        printf("%d", digit);
        if (count > 1)
        {
            printf(" ");
        }
        temp = temp % pow(10, count - 1);
        count--;
    } while (count!=0);
    
    printf("
");
    return 0;
}
int pow(int a, int b)
{
    int result = 1;
    for (int i = 0; i < b; i++)
    {
        result = result * a;
    }

    return result;
}

2、参考老师讲解视频修改版

/*
    正序输出整数的每一位数，数字之间用空格隔开
    123456    1 2 3 4 5 6
*/

#include <stdio.h>

int main()
{
    int n;

    scanf_s("%d", &n);

    int count = 0;
    int temp = n;
    int mask = 1;
    do
    {
        temp = temp / 10;
        count++;
        mask = mask * 10;
    } while (temp!=0);

    mask = mask / 10;
    //分离出每一位数
    int digit;
    temp = n;
    do
    {
        digit = temp / mask;
        printf("%d", digit);
        if (count > 1)
        {
            printf(" ");
        }
        temp = temp % mask;
        count--;
        mask = mask / 10;
    } while (count!=0);
    
    printf("
");
    return 0;
}