C - Pointers - Discussion

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Q.

main()
{
char *p="hai friends",*p1;
p1=p;
while(*p!='\0') ++*p++;
printf("%s %s",p,p1);
}
A. ibj! jfoetgs B. foetibj!gsj
C. ibj!gsjfoet D. ib!gsjfojet

Answer: Option C
Explaination:

++*p++ will be parse in the given order

*p that is value at the location currently pointed by p will be taken ++*p the retrieved value will be incremented.when ; is encountered the location will be incremented that is p++ will be executed
Hence, in the while loop initial value pointed by p is 'h', which is changed to 'i' by executing ++*p and pointer moves to point, 'a' which is similarly changed to 'b' and so on. Similarly blank space is converted to '!'. Thus, we obtain value in p becomes "ibj!gsjfoet" and since p reaches '\0' and p1 points to p thus p1doesnot print anything.



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