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:

 char ** createBuff(char **buff, int arrayLength, int charLength){

     int i;

     buff = (char **)malloc(sizeof(char *) * arrayLength); //给*buff分配空间,buff指向它的首地址

     for (i = ; i < arrayLength; ++i){

         buff[i] = (char *)malloc(sizeof(char) * charLength); //*buff[i]分配空间,buff[i]指向它的首地址

     }

     return buff;
 }

 void initDemo(char **buff, int arrayLength){

     int i;

     for (i = ; i < arrayLength; ++i){

         sprintf(buff[i], "%d%d%d", i +  , i + , i + );

     }
 }

 void destoryBuff(char **buff, int arrayLength){

     int i;

     for (i = ; i < arrayLength; ++i){

         if(buff[i] != NULL){

             free(buff[i]);    

             buff[i] = NULL;

         }

     }

     if(buff != NULL){

         free(buff);

         buff = NULL;

     }
 }

 void printBuff(char ** buff, int arrayLength){

     int i ;

     for (i = ; i < arrayLength; ++i){
         printf("%s\n", buff[i]);
     }
 }

 void sortBuffArray(char ** buff, int arrayLength){

     int i, j;

     char *temp = NULL;

     for( i = ; i < arrayLength; ++i){

         for(j = i + ; j < arrayLength; ++j){

             if(strcmp(buff[j], buff[i]) > ){

                 temp = buff[i];

                 buff[i] = buff[j];

                 buff[j] = temp;

             }

         }

     }

 }

测试:

void main(){

    int arrayLength = , charLength = ;

    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。