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2¡¢int (*ptr) (),ÔòptrÊÇһάÊý×éµÄÃû×Ö¡££¨   F£¬ ptrΪһ¸öº¯ÊýÖ¸Õë  £©
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4¡¢switch(c) Óï¾äÖÐc¿ÉÒÔÊÇint ,long,char ,float ,unsigned int ÀàÐÍ¡££¨ F£¬²»¿ÉÒÔΪfloat  £©
5¡¢#define print(x)  printf(£¢the no, £¢#x£¢,is £¢) (T)
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1¡¢ÔÚwindowsÏ£¬Ð´³öÔËÐнá¹û£¬Ã¿¿Õ2·Ö£¬¹²10·Ö¡£
char str[ ]= £¢Hello£¢;
char *p=str;
int n=10;
sizeof(str)=(   6  )
sizeof(p)=(  4   )
sizeof(n)=(  4   )
void func(char str[100])
{    }
sizeof(str)=(  4  )
2¡¢void setmemory(char **p, int num)
{ *p=(char *) malloc(num);}
void test(void)
{  char *str=NULL;
   setmemory(&str,100);
   strcpy(str,£¢hello£¢);
   printf(str);
}
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3¡¢Éèint arr[]={6,7,8,9,10};
     int *ptr=arr;
   *(ptr++)+=123;
 printf(£¢%d,%d£¢,*ptr,*(++ptr));
(       8, 8                            ) 10·Ö
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1¡¢²»Ê¹Óÿ⺯Êý£¬±àдº¯Êýint strcmp(char  *source, char *dest) ÏàµÈ·µ»Ø0£¬²»µÈ·µ»Ø-1£»
££i nclude <stdio.h>
££i nclude <stdlib.h>
int mystrcmp(char *source, char *dest)
{
 while(*source == *dest && *source != '\0' && *dest != '\0')
 {
  source++;
  dest++;
&


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