Question 2
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The program below has a problem. Which statement correctly describes it?
#include <stdio.h>
int main(void) {
int *p;
*p = 25;
printf("%d\n", *p);
return 0;
}- A int *p; – a pointer cannot be declared without a value
- B *p = 25; – p was never given an address, so this writes to a random location Correct
- C printf should print p, not *p
- D There is no error; it prints 25
Correct Answer: Option B
Declaring int *p; is legal, but p holds garbage – a wild pointer. *p = 25 writes to an unknown address: undefined behaviour, often a crash. Point it at real memory first, e.g. int n; int *p = &n;.
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