Q. What int value means in exit(int) function?
A: Return a value to OS, let OS know the exit state of your process.
Only lowest 8 bits are used. Usually return 0 means no error. Otherwise, errorcode. 
Q. Is *(p++) the same as (*p)++?
A: No, absolutely not.
  • *(p++) is getting the value pointed by the pointer first, then move the pointer by 1.
  • *(p)++ is getting the value pointed by the pointer first, then add 1 to the value.

Try the following code, results are commented into the code.

#include<stdio.h>
void main() {
long llist1[3] = {50, 60, 70};
long* p1 = llist1;
p1++;
printf("%d/n", *p1); // 60
long llist2[3] = {50, 60, 70};
long* p2 = llist2;
Q. What does define mean in C, is it constant?
A: No, it is called macro, which just replace the same notation with the same text.
It can be used as constant, but be careful, there should be no "=" sign there. See the following example.

#define THREE 3
#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
long n = (*p2);
n++;
printf("%d/n", n); // 51
} 



												


											

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