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What is the o...

Question

What is the output of the following program?
# include <stdio.h>
int main ( )
{
int x = 5;
int * const ptr = &x;
++(*ptr)
printf("%d", x);
return 0;
}

A

6

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B

5

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C

Runtime Error

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D

Compiler Error

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Solution

The correct option is A 6
See following declarations to know the difference between constant pointer and a pointer to a constant.
int* constptr $\to$ ptr is constant pointer. You can change the value at the location pointed by pointer p, but you cannot change p to point to other location.

int const * ptr $\to$ ptr is a pointer to a constant. You can change ptr to point other variable. But you cannot change the value pointed by ptr.
Therefore above program works well because we have a constant pointer and we are not changing ptr to point to any other location.
We are only incrementing value pointed by ptr.

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