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void GetMemory(char *p,int num)
{
p = (char *)malloc(sizeof(char),num);
return;
}

int main()
{
char *str = NULL;
GetMemory(&str,100);
strcpy(str,"Helllo World.");
printf(str);

return 0;
}


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£¨1£©Äܹ»Êä³öHelllo World.
£¨2£©ÄÚ´æÐ¹Â©



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¸ßÖÊÁ¿CÁÖÈñ¸½C++Ìâ
£¨1£©Äܹ»Êä³öHelllo World.
£¨2£©ÄÚ´æÐ¹Â©

ûÓÐÊÍ·ÅÄڴ棬ÍüÁË¡£returnǰ¼ÓÒ»¾ä:
free(str);

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ÎÊÌâ2£ºmalloc²ÎÊý´íÎó¡£
ÎÊÌâ3£ºGetMemoryÐèÒª¶þ¼¶Ö¸ÕëÐβΣ¬²ÅÄÜ´ïµ½ÐÞ¸ÄÒ»¼¶Ö¸ÕëµÄÄ¿µÄ.

C/C++ code

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

void GetMemory(char **p,int num) //¶þ¼¶Ö¸Õë
{
//p = ¡­¡­


Õý½â...

C/C++ code:

void GetMemory(char *p,int num)
{
p = (char *)malloc(sizeof(char) * num); // Õâ¶ùÓ¦¸ÃÊÇ*°É¡£
return;
}

int main()
{
char *str = NULL; // Õâ¾äÏ൱ÓÚconst char* str = NULL; str ²»¿É±ä¡£
GetMemory(str,100); //Õâ¾ästr»¹ÊÇNULL¡£
strcpy(str,"Helllo World.");
printf(str);

return 0;
}




C/C++ c


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