关于#c语言#的问题：主函数输入三个字符串由被调函数处理后，主函数按照先长后短的顺序输出它们

Question

主函数输入三个字符串由被调函数处理后，主函数按照先长后短的顺序输出它们。利用指针数组操作。这个代码要怎么写呢？

Answer 1

/*
 * Author: Zhengjie Gao
 * E-mial: [e-mail]
 * Time:   2021-9-18 13:09:02
 */

#include <stdio.h>
#include <string.h>

#define LEN 3

/**
 * 按照字符串大小进行排序
 * @param arr
 */
void sort_by_ascii(char arr[][256]) {
    for (int i = 0; i < LEN - 1; i++) {
        for (int j = i + 1; j < LEN; j++) {
            if (strcmp(arr[i], arr[j]) < 0) {
                char tmp[256] = {0};
                strcpy(tmp, arr[j]);
                strcpy(arr[j], arr[i]);
                strcpy(arr[i], tmp);
            }
        }
    }
}

/**
 * 按照字符串长短排序
 * @param arr
 */
void sort_by_len(char arr[][256]) {
    for (int i = 0; i < LEN - 1; i++) {
        for (int j = i + 1; j < LEN; j++) {
            if (strlen(arr[i]) < strlen(arr[j])) {
                char tmp[256] = {0};
                strcpy(tmp, arr[j]);
                strcpy(arr[j], arr[i]);
                strcpy(arr[i], tmp);
            }
        }
    }

}


int main(void) {
    char arr[LEN][256] = {0};
    printf("Please input three string:\n");
    int i = LEN;
    for (int i = 0; i < LEN; i++)
        gets(arr[i]);
    
    sort_by_ascii(arr);
    printf("The Result of sort by ascii:\n");
    for (int i = 0; i < LEN; i++)
        puts(arr[i]);

    sort_by_len(arr);
    printf("The Result of sort by length:\n");
    for (int i = 0; i < LEN; i++)
        puts(arr[i]);
}