【C语言提高28】多级指针

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

//产生molloc内存
char**getMem61(int num)
{

int i = 0, j = 0;
char** p2 = NULL;
if (p2 == NULL)
{
return NULL;
}
p2 = (char**)malloc(sizeof(char*)*num);
for (i = 0; i < num; i++)
{
p2[i] = (char*)malloc(sizeof(char) * 100);//相当于 char  buf[100];
sprintf(p2[i], "%d%d%d", i + 1, i + 1, i + 1);//向内存空间中打印数据
}

return p2;
}

//利用三级指针返回二级指针
int getMem62(char***p2,int num)
{
int i = 0;
char**tmp = NULL;
if (p2 == NULL)
{
return -1;
}
tmp = (char**)malloc(sizeof(char*)*num);

*p2 = tmp;
if (p2 == NULL)
{
return NULL;
}

for (i = 0; i < num; i++)
{
*p2[i] = (char*)malloc(sizeof(char) * 100);//相当于 char  buf[100];
sprintf(*p2[i], "%d%d%d", i + 1, i + 1, i + 1);//向内存空间中打印数据
}

return 0;
}

//利用三级指针释放二级指针
void getMemFree62(char***p2, int num)
{
int i = 0;
char**tmp = NULL;
if (p2 == NULL)
{
return;
}

tmp = *p2;
//释放所指向的内存空间
for (i = 0; i < num; i++)
{
free(tmp[i]);
}
free(tmp);
*p2 = NULL;//把实参置为NULL
}

void main()
{
int i = 0, j = 0;
char** p2 = NULL;
char*tmp;
char tmpbuf[100];
int num = 5;
getMem62(&p2,num);
for (i = 0; i < num; i++)
{
printf("p2:%s",p2[i]);
}

printf("\nhehhe");
system("pause");
return;
}