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char a = 'A'; // global variable
void msg()
{
printf("Hello\n");
}
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int main(void)
{
extern char a; // extern variable must be declared before use
printf("%c ", a);
(void)msg();
return 0;
}
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A Hello
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int fun(void){
static int count = 10; //ÊÂʵÉϴ˸³ÖµÓï¾ä´ÓÀ´Ã»ÓÐÖ´Ðйý
return count--;
}
int count = 1;
int main(void)
{
printf("global\t\tlocal static\n");
for(; count <= 10; ++count)
printf("%d\t\t%d\n", count, fun());
return 0;
}
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global local static
1 10
2 9
3 8
4 7
5 6
6 5
7 4
8 3
9 2
10 1
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char* my_strrev( char* string )
{
 char *left, *right, ch;
 left = right = string;
 while( *right++ != '\0');
 right -= 2;
 while( left<right )
 {
  ch = *left;
  *left = *right;
  *right = ch;
  ++left; --right;
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#ifdef __cplusplus
extern "C" {
#endif
/**** some declaration or so *****/
#ifdef __cplusplus
}
#endif /* end of __cplusplus */
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