Sizeof Keyword - C Language Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Sizeof Keyword – 2”.

Pre-requisite for this C MCQ set: Advanced C Programming Video Tutorial.

1. 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
View Answer

Answer: d
Explanation: None.

2. Which among the following is never possible in C when members in a structure are the same as that in a union?

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

a) sizeof(P) is greater than sizeof(Q)
b) sizeof(P) is equal to sizeof(Q)
c) sizeof(P) is less than to sizeof(Q)
d) none of the mentioned
View Answer

Answer: c
Explanation: None.

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3. 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
View Answer

Answer: d
Explanation: None.

4. What will be the output of the following C code?

```
    #include <stdio.h>
```
```
    main()
```
```
    {
```
```
        int a = 1;
```

        printf("size of a is %d, ", sizeof(++a));

```
        printf("value of a is %d", a);
```
```
    };
```

a) size of a is 4, value of a is 1
b) size of a is 4, value of a is 2
c) size of a is 2, value of a is 2
d) size of a is 2, value of a is 2
View Answer

Answer: a
Explanation: None.

5. Which among the following statement is right?
a) sizeof(struct stemp*) > sizeof(union utemp*) > sizeof(char *)
b) sizeof(struct stemp*) < sizeof(union utemp*) < sizeof(char *)
c) sizeof(struct stemp*) = sizeof(union utemp*) = sizeof(char *)
d) the order Depends on the compiler
View Answer

Answer: c
Explanation: None.

6. 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
View Answer

Answer: a
Explanation: None.

7. Which of the following cannot be used inside sizeof?
a) pointers
b) functions
c) macro definition
d) none of the mentioned
View Answer

Answer: d
Explanation: None.

8. What will be the output of the following C code?

```
    #include <stdio.h>
```

    (sizeof double = 8, float = 4, void = 1)

```
    #define PI 3.14
```
```
    int main()
```
```
    {
```
```
        printf("%d", sizeof(PI));
```
```
    }
```

a) Output is 8
b) Output is 4
c) Output is 1
d) Error, we can’t use sizeof on macro-definitions
View Answer

Answer: a
Explanation: None.

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