Operators and Expressions - C Programming MCQ Questions and Answers

71

What type of value does sizeof return?

A) char B) short C) unsigned int D) long

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Answer & Solution

Answer: Option C

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72

Which among the following is never possible in C when members are different in a structure and union?

//Let P be a structure
//Let Q be a union

A) sizeof(P) is greater than sizeof(Q) B) sizeof(P) is less than sizeof(Q) C) sizeof(P) is equal to sizeof(Q) D) none of the mentioned

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Answer & Solution

Answer: Option D

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73

What will be the size of the following C structure?

#include <stdio.h>
struct temp
{
    int a[10];
    char p;
};

A) 5 B) 11 C) 41 D) 44

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Answer & Solution

Answer: Option D

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74

What is the sizeof(void) in a 32-bit C?

A) 0 B) 1 C) 2 D) 4

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Answer & Solution

Answer: Option B

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75

Which of the following cannot be used inside sizeof?

A) pointers B) functions C) macro definition D) none of the mentioned

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Answer & Solution

Answer: Option B

Solution:

sizeof is a compile-time operator in C that determines the size, in bytes, of a variable or data type.

Option A: pointers – Valid. sizeof can be used with pointers to determine the size of the pointer type.

Option B: functions – Invalid. You cannot use sizeof on functions because functions do not have a defined size at compile time. sizeof requires a complete type, and functions are not complete objects in C.

Option C: macro definition – Valid. If the macro expands to a valid expression or type, sizeof can be used on it.

Option D: none of the mentioned – Incorrect because functions cannot be used with sizeof.

Therefore, the correct answer is Option B: functions.

76

Which data type is suitable for storing a number like?

10.0000000001

A) int B) float C) double D) both float and double

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Answer & Solution

Answer: Option C

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77

In a 32-bit compiler, which 2 types have the same size?

A) char and short B) short and int C) int and float D) float and double

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Answer & Solution

Answer: Option C

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78

What will be the output of the following C code?

#include <stdio.h>
printf("%d", sizeof(strlen("HELLOWORLD")));

A) Output, 4 B) Output, 10 C) Output, 16 D) Error, sizeof cannot evaluate size of a function

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Answer & Solution

Answer: Option A

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79

What will be the output of the following C code?

#include <stdio.h>
printf("%.0f", 2.89);

A) 2.890000 B) 2.89 C) 2 D) 3

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Answer & Solution

Answer: Option D

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80

What is the sizeof(char) in a 32-bit C compiler?

A) 1 bit B) 2 bits C) 1 Byte D) 2 Bytes

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Answer & Solution

Answer: Option C

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