Question 8
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The program below has a memory bug. Which statement correctly describes it?
#include <stdio.h>
#include <stdlib.h>
struct record {
char name[24];
int score;
};
int main(void) {
struct record *r = malloc(sizeof r);
if (r == NULL)
return 1;
r->score = 90;
printf("%d\n", r->score);
free(r);
return 0;
}- A struct record cannot be allocated
- B sizeof r is the pointer size (8), not the 28-byte struct, so r->score is outside the block Correct
- C r->score should be r.score
- D There is no problem
Correct Answer: Option B
One missing *: sizeof r measures the pointer. Writing score at offset 24 lands past the 8-byte block. Write malloc(sizeof *r).
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