输入整数，按照从大到小的排序输出（两个方法，一个思考）

#include<stdio.h>
main()
{
    int a, b, c;
    printf("请输入分别三个整数a,b,c:\n");
    scanf_s("%d %d %d", &a, &b, &c);
    if (a > b && a > c && b > C)
    {
        printf("从大到小的排序为：%d>%d>%d", a, b, c);
    }
    else if (a > c && c > b)
    {
        printf("从大到小的排序为：%d>%d>%d", a, c, b);
    }
    else if (b > c && c > a)
    {
        printf("从大到小的排序为：%d>%d>%d", b, c, a);

    }
    else if (b > a && a > C)
    {
        printf("从大到小的排序为：%d>%d>%d", b, a, c);
    }
    else if (c > a && a > b)
    {
        printf("从大到小的排序为：%d>%d>%d", c, a, b);
    }
    else if (c > b && b > a)
    {
        printf("从大到小的排序为：%d>%d>%d", c, b, a);
    }
    else
    {
        printf("您输入的字符不符合要求，请重新输入！");
    }
}

#include<stdio.h>
main()
{
    int a, b, c, d;
    printf("请输入分别三个整数a,b,c:\n");
    scanf_s("%d%d%d",&a,&b,&c);
    if (a < b)
    {
        d = a;
        a = b;
        b = d;
    }
    if (a < C)
    {
        d = a;
        a = c;
        c = d;
    }
    if (b < C)
    {
        d = b;
        b = c;
        c = d;
    }
    printf("从大到小排序为：%d>%d>%d",a,b,c);
}

#include <stdio.h>
main()
{
    int num, n, temp;//定义变量
    int a[100];   //初始化数组
    printf("您要重新排列多少个数:  \n");
    scanf_s("%d", &num);
    n = num;  //获取数组的长度    另外还有一种：n = sizeof(a) / sizeof(a[0]);  
            /*a[0]是int型, 占4字节, 所以总的字节数除以4等于元素的个数*/
    int i = 0;
    printf("请您输入排列的数：\n");
    while (scanf_s("%d", &a[i]) && num > 1)  //循环向数组中存入数，当循环
    {
        i++;
        num--;
    }
    printf("排列之前的顺序为：");
    for (int length = 0; length < n; length++)
    {
        printf("%3d", a[length]);
    }
    for (int j = 0; j < n - 1; j++)  //比较n-1轮
    {
        for (int k = 0; k < n - 1 - j; k++)  //每轮比较n-1-i次,
        {
            
            if (a[k] < a[k+1]) //从大到小
            {
                temp = a[k];
                a[k] = a[k+1];
                a[k+1] = temp;
            }
            /*
            if (a[k] > a[k + 1]) //从小到大
            {
                temp = a[k];
                a[k] = a[k + 1];
                a[k + 1] = temp;
            }
            */
        }
    }
    printf("\n");
    printf("排列之后的顺序为：");
    for (int len = 0; len < n; len++)
    {
        printf("%3d", a[len]);
    }
    printf("\n");
}