字符串数组作为实参以及形参的表示

main.c

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

// #include "../include/utils.h"

#define ROW 5
#define LENGTH 40

int menu();

void inputs(char *arr[], int row);

void prints(char *arr[], int row);

void sort_by_ascii(char *arr[], int row);

void sort_by_length(char *arr[], int row);

char **sort_by_first(char *arr[], int row);

char * s_gets(char * str, int n)
{
    char * ptr = fgets(str, n, stdin);
    // 如果是空行，返回值统一处理
    if( '\n' == *ptr )
        ptr = NULL;
    else
        for(int i = 0; i < n; i++)
        {
            if(*(ptr + i) == '\0')
            {
                break;
            }
            else if(*(ptr + i) == '\n')
            {
                *(ptr + i) = '\0';
                break;
            }
        }
    return ptr;

}

void call(int row, int col, char arr[row][col]) {
    printf("call start=====\n");
    for (int i = 0; i < row; ++i) {
        printf("%s\t", arr[i]);
    }
    printf("\ncall end=======\n");
}

int main(int argc, char *argv[]) {
    char arr[ROW][LENGTH];
    char *ptr[ROW];

    for (int i = 0; i < ROW; ++i) {
        // 必须要这一步，否则排序就比较麻烦
        ptr[i] = arr[i];
    }

    inputs(ptr, ROW);
    call(ROW, LENGTH, arr);
    while (1) {
        int select = menu();
        char **s;
        switch (select) {
            case 1:
                prints(ptr, ROW);
                break;
            case 2:
                sort_by_ascii(ptr, ROW);
                prints(ptr, ROW);
                break;
            case 3:
                sort_by_length(ptr, ROW);
                prints(ptr, ROW);
                break;
            case 4:
                s = sort_by_first(ptr, ROW);
                printf("return============================%s\n", s[0]);
                prints(ptr, ROW);
                break;
            default:
                printf("%d is a invalid selection!\n", select);
                break;
        }
        if (select > 4 || select < 1)
            break;
    }
    return 0;
}

void sort_by_ascii(char *arr[], int row) {
    for (int i = 0; i < row - 1; i++) {
        for (int j = 0; j < row - 1 - i; j++) {
            if (strcmp(arr[j], arr[j + 1])) {
                char *tmp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = tmp;
            }
        }
    }
}

void sort_by_length(char *arr[], int row) {
    for (int i = 0; i < row - 1; i++) {
        for (int j = 0; j < row - 1 - i; j++) {
            if (strlen(arr[j]) < strlen(arr[j + 1])) {
                char *tmp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = tmp;
            }
        }
    }
}

char **sort_by_first(char *arr[], int row) {
    for (int i = 0; i < row - 1; i++) {
        for (int j = 0; j < row - 1 - i; j++) {
            if (*arr[j] > *arr[j + 1]) {
                char *tmp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = tmp;
            }
        }
    }
    return arr;
}


void prints(char *arr[], int row) {
    for (int i = 0; i < row; i++) {
        puts(arr[i]);
    }
}

void inputs(char *arr[], int row) {
    printf("please input %d lines:\n", row);
    for (int i = 0; i < row; ++i) {
        s_gets(arr[i], LENGTH);
    }
}

int menu() {
    puts("############# SELECT MENU ##################");
    puts("1. print by origin    2. print by ascii");
    puts("3. print by len       4. print by first");
    int selected;
    int ch;
    while ((1 != scanf("%d", &selected))) {
        while ((ch = getchar()) != '\n')
            putchar(ch);
        printf(" is not valid menu. please input number[1,4] again:\n");
    }
    return selected;
}

#include "../include/utils.h"
这个头文件怎么找不到，您能告知一下在哪吗

@LGFHD 感谢提醒。这个 gist 我本地还没有编译过。对应这里面只有一个函数 s_gets() 是来自于 utils.h 的，我直接把这个函数加到 main.c 里面了。验证可以编译运行了。重新下载这个main.c 即可。

void call(int row, int col, char arr[row][col])
我用VS编译显示 E0411：不允许使用参数，（row和col）

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

// #include "../include/utils.h"

#define ROW 5
#define LENGTH 40

int menu();

void inputs(char *arr[], int row);

void prints(char *arr[], int row);

void sort_by_ascii(char *arr[], int row);

void sort_by_length(char *arr[], int row);

char **sort_by_first(char *arr[], int row);

char * s_gets(char * str, int n)
{
    char * ptr = fgets(str, n, stdin);
    // 如果是空行，返回值统一处理
    if( '\n' == *ptr )
        ptr = NULL;
    else
        for(int i = 0; i < n; i++)
        {
            if(*(ptr + i) == '\0')
            {
                break;
            }
            else if(*(ptr + i) == '\n')
            {
                *(ptr + i) = '\0';
                break;
            }
        }
    return ptr;

}

void call(int row, int col, char **arr) {
    printf("call start=====\n");
    for (int i = 0; i < row; ++i) {
        printf("%s\t", arr[i]);
    }
    printf("\ncall end=======\n");
}

int main(int argc, char *argv[]) {
    char arr[ROW][LENGTH];
    char *ptr[ROW];
    char *origin[ROW];
    for (int i = 0; i < ROW; ++i) {
        // 必须要这一步，否则排序就比较麻烦
        ptr[i] = arr[i];
        origin[i] = arr[i];
    }

    inputs(ptr, ROW);
    call(ROW, LENGTH, ptr);
    while (1) {
        int select = menu();
        char **s;
        switch (select) {
            case 1:
                prints(origin, ROW);
                break;
            case 2:
                sort_by_ascii(ptr, ROW);
                prints(ptr, ROW);
                break;
            case 3:
                sort_by_length(ptr, ROW);
                prints(ptr, ROW);
                break;
            case 4:
                s = sort_by_first(ptr, ROW);
                printf("return============================%s\n", s[0]);
                prints(ptr, ROW);
                break;
            default:
                printf("%d is a invalid selection!\n", select);
                break;
        }
        if (select > 4 || select < 1)
            break;
    }
    return 0;
}

void sort_by_ascii(char *arr[], int row) {
    for (int i = 0; i < row - 1; i++) {
        for (int j = 0; j < row - 1 - i; j++) {
            if (strcmp(arr[j], arr[j + 1])) {
                char *tmp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = tmp;
            }
        }
    }
}

void sort_by_length(char *arr[], int row) {
    for (int i = 0; i < row - 1; i++) {
        for (int j = 0; j < row - 1 - i; j++) {
            if (strlen(arr[j]) < strlen(arr[j + 1])) {
                char *tmp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = tmp;
            }
        }
    }
}

char **sort_by_first(char *arr[], int row) {
    for (int i = 0; i < row - 1; i++) {
        for (int j = 0; j < row - 1 - i; j++) {
            if (*arr[j] > *arr[j + 1]) {
                char *tmp = arr[j];
                arr[j] = arr[j + 1];
                arr[j + 1] = tmp;
            }
        }
    }
    return arr;
}


void prints(char *arr[], int row) {
    for (int i = 0; i < row; i++) {
        puts(arr[i]);
    }
}

void inputs(char *arr[], int row) {
    printf("please input %d lines:\n", row);
    for (int i = 0; i < row; ++i) {
        s_gets(arr[i], LENGTH);
    }
}

int menu() {
    puts("############# SELECT MENU ##################");
    puts("1. print by origin    2. print by ascii");
    puts("3. print by len       4. print by first");
    int selected;
    int ch;
    while ((1 != scanf("%d", &selected))) {
        while ((ch = getchar()) != '\n')
            putchar(ch);
        printf(" is not valid menu. please input number[1,4] again:\n");
    }
    return selected;
}

用这个看看。可能部分编译器不支持使用 char arr[row][col] 这种格式的参数。 上面这个如果还是编译失败，换成 void call(int row, int col, char *arr[]) .