Data Types & Sizes - C Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Data Types and Sizes – 2”.

Pre-requisite for C Data Types MCQ set: Video Tutorial on C Data Types.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        float f1 = 0.1;
```
```
        if (f1 == 0.1)
```
```
            printf("equal\n");
```
```
        else
```
```
            printf("not equal\n");
```
```
    }
```

a) equal
b) not equal
c) output depends on the compiler
d) error
View Answer

Answer: b
Explanation: 0.1 by default is of type double which has different representation than float resulting in inequality even after conversion.
Output:
$ cc pgm4.c
$ a.out
not equal

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

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```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        float f1 = 0.1;
```
```
        if (f1 == 0.1f)
```
```
            printf("equal\n");
```
```
        else
```
```
            printf("not equal\n");
```
```
    }
```

a) equal
b) not equal
c) output depends on compiler
d) error
View Answer

Answer: a
Explanation: 0.1f results in 0.1 to be stored in floating point representations.
Output:
$ cc pgm5.c
$ a.out
equal

3. What will be the output of the following C code on a 32-bit machine?

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        int x = 10000;
```
```
        double y = 56;
```
```
        int *p = &x;
```
```
        double *q = &y;
```

        printf("p and q are %d and %d", sizeof(p), sizeof(q));

```
        return 0;
```
```
    }
```

a) p and q are 4 and 4
b) p and q are 4 and 8
c) compiler error
d) p and q are 2 and 8
View Answer

Answer: a
Explanation: Size of any type of pointer is 4 on a 32-bit machine.
Output:
$ cc pgm6.c
$ a.out
p and q are 4 and 4

4. Which is correct with respect to the size of the data types?
a) char > int > float
b) int > char > float
c) char < int < double
d) double > char > int
View Answer

Answer: c
Explanation: char has less bytes than int and int has less bytes than double in any system

5. What will be the output of the following C code on a 64 bit machine?

```
    #include <stdio.h>
```
```
    union Sti
```
```
    {
```
```
        int nu;
```
```
        char m;
```
```
    };
```
```
    int main()
```
```
    {
```
```
        union Sti s;
```
```
        printf("%d", sizeof(s));
```
```
        return 0;
```
```
    }
```

a) 8
b) 5
c) 9
d) 4
View Answer

Answer: d
Explanation: Since the size of a union is the size of its maximum data type, here int is the largest data type. Hence the size of the union is 4.
Output:
$ cc pgm7.c
$ a.out
4

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        float x = 'a';
```
```
        printf("%f", x);
```
```
        return 0;
```
```
    }
```

a) a
b) run time error
c) a.0000000
d) 97.000000
View Answer

Answer: d
Explanation: Since the ASCII value of a is 97, the same is assigned to the float variable and printed.
Output:
$ cc pgm8.c
$ a.out
97.000000

7. Which of the data types has the size that is variable?
a) int
b) struct
c) float
d) double
View Answer

Answer: b
Explanation: Since the size of the structure depends on its fields, it has a variable size.

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