Question 4
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The program below has a problem. Which statement correctly describes it?
#include <stdio.h>
struct status {
unsigned ready : 1;
unsigned error : 1;
};
void set(unsigned *flag) { *flag = 1; }
int main(void) {
struct status s = {0};
set(&s.ready);
printf("%u\n", s.ready);
return 0;
}- A &s.ready – the address of a bit-field cannot be taken Correct
- B set() must take an int
- C Bit-fields cannot be initialised with {0}
- D There is no error; it prints 1
Correct Answer: Option A
A bit-field may start in the middle of a byte, so it has no address of its own. Set it directly (s.ready = 1;) or pass a pointer to the whole struct.
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