C语言实现二级指针表示字符串数组

头文件:

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

函数原型:

char ** createBuff(char **buff, int arraylength, int charLength); //创建二级指针

void initDemo(char **buff, int arrayLength);    //初始化二级指针

void destoryBuff(char **buff, int arrayLength);    //销毁二级指针

void printBuff(char ** buff, int arrayLength);    //遍历二级指针

void sortBuffArray(char ** buff, int arrayLength);    //排序

实现函数:

 1 char ** createBuff(char **buff, int arrayLength, int charLength){
 2
 3     int i;
 4
 5     buff = (char **)malloc(sizeof(char *) * arrayLength); //给*buff分配空间,buff指向它的首地址
 6
 7     for (i = 0; i < arrayLength; ++i){
 8
 9         buff[i] = (char *)malloc(sizeof(char) * charLength); //*buff[i]分配空间,buff[i]指向它的首地址
10
11     }
12
13     return buff;
14 }
15
16 void initDemo(char **buff, int arrayLength){
17
18     int i;
19
20     for (i = 0; i < arrayLength; ++i){
21
22         sprintf(buff[i], "%d%d%d", i + 1 , i + 1, i + 1);
23
24     }
25 }
26
27 void destoryBuff(char **buff, int arrayLength){
28
29     int i;
30
31     for (i = 0; i < arrayLength; ++i){
32
33         if(buff[i] != NULL){
34
35             free(buff[i]);
36
37             buff[i] = NULL;
38
39         }
40
41     }
42
43     if(buff != NULL){
44
45         free(buff);
46
47         buff = NULL;
48
49     }
50 }
51
52
53
54 void printBuff(char ** buff, int arrayLength){
55
56     int i ;
57
58     for (i = 0; i < arrayLength; ++i){
59         printf("%s\n", buff[i]);
60     }
61 }
62
63 void sortBuffArray(char ** buff, int arrayLength){
64
65     int i, j;
66
67     char *temp = NULL;
68
69     for( i = 0; i < arrayLength; ++i){
70
71         for(j = i + 1; j < arrayLength; ++j){
72
73             if(strcmp(buff[j], buff[i]) > 0){
74
75                 temp = buff[i];
76
77                 buff[i] = buff[j];
78
79                 buff[j] = temp;
80
81             }
82
83         }
84
85     }
86
87 }

测试:

void main(){

    int arrayLength = 5, charLength = 100;

    char **buff = NULL;

    buff = createBuff(buff, arrayLength, charLength);

    initDemo(buff, arrayLength);

    printf("排序前\n");

    printBuff(buff, arrayLength);

    sortBuffArray(buff, arrayLength);

    printf("排序后\n");

    printArray(buff, arrayLength);

    destoryBuff(buff, arrayLength);

    system("pause");
}

注意:

char **buff 变量不能当作实参传入到createBuff函数中的形参，以为createBuff函数调用结束会释放掉形参buff ，因此只能当作返回值返回或者，函数中定义三级指针，调用时传入buff的地址即可。