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void GetMemory(char *p)
{
p = (char *)malloc(100);
}
void Test(void)
{
char *str = NULL;
GetMemory(str);
strcpy(str£¬ "hello world");
printf(str);
}
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ÒòΪGetMemory ²¢²»ÄÜ´«µÝ¶¯Ì¬Äڴ棬
Test º¯ÊýÖÐµÄ str Ò»Ö±¶¼ÊÇ NULL¡£
strcpy(str£¬ "hello world");½«Ê¹³ÌÐò±À
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char *GetMemory(void)
{
char p[] = "hello world";
return p;
}
void Test(void)
{
char *str = NULL;
str = GetMemory();
printf(str);
}
ÇëÎÊÔËÐÐTest º¯Êý»áÓÐʲôÑùµÄ½á¹û£¿
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ÒòΪGetMemory ·µ»ØµÄÊÇÖ¸Ïò“Õ»ÄÚ´æ”
µÄÖ¸Õ룬¸ÃÖ¸ÕëµÄµØÖ·²»ÊÇ NULL£¬µ«ÆäÔ­
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void GetMemory2(char **p£¬ int num)
{
*p = (char *)malloc(num);
}
void Test(void)
{
char *str = NULL;
GetMemory(&str£¬ 100);
strcpy(str£¬ "hello");
printf(str);
}
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void Test(void)
{
char *str = (char *) malloc(100);
strcpy(str£¬ “hello”);
free(str);
if(str £¡= NULL)
{
strcpy(str£¬ “world”);
printf(str);
}
}
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ÒòΪfree(str);Ö®ºó£¬str ³ÉΪҰָÕ룬
if(str £¡= NULL)Óï¾ä²»Æð×÷Óá£
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