What is the output of the following program, compiled as C23? #include enum small : unsigned char { S0, S1 = 200, S2 }; int main(void) { enum small x = S2; printf("%zu %d\n", sizeof x, x); return 0; }

Structures, Unions, Enums · Predict the Output · Question 12

C23 enum : unsigned char – size and value Answer, explanation & discussion

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Question 12 Back to Exercise

What is the output of the following program, compiled as C23?

main.c

#include <stdio.h>

enum small : unsigned char { S0, S1 = 200, S2 };

int main(void) {
    enum small x = S2;
    printf("%zu %d\n", sizeof x, x);
    return 0;
}

A 1 201 Correct
B 4 201
C 1 2
D Compilation error

Correct Answer: Option A

The enum's underlying type is fixed to unsigned char, so a variable of it is 1 byte. S1 is 200 and S2 follows at 201, which still fits in an unsigned char (0–255).

Output Struct designated initializers out of order – output
Output Enum values with gaps and expressions – output
Output sizeof three structures with padding – output
Output Reading an int's bytes through a union – output
Output Struct copy with a pointer member (shallow copy)
Output Array of structures with a pointer – output

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C23 enum : unsigned char – size and value Answer, explanation & discussion

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