Conditional Inclusion in C Questions and Answers for Entrance Exams

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

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

1. For each #if, #ifdef, and #ifndef directive.
a) There are zero or more #elif directives
b) Zero or one #else directive
c) One matching #endif directive
d) All of the mentioned
View Answer

Answer: d
Explanation: None.

2. The #else directive is used for _________
a) Conditionally include source text if the previous #if, #ifdef, #ifndef, or #elif test fails
b) Conditionally include source text if a macro name is not defined
c) Conditionally include source text if a macro name is defined
d) Ending conditional text
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #define MIN 0
```
```
    #if MIN
```
```
    #define MAX 10
```
```
    #endif
```
```
    int main()
```
```
    {
```
```
        printf("%d %d\n", MAX, MIN);
```
```
        return 0;
```
```
    }
```

a) 10 0
b) Compile time error
c) Undefined behaviour
d) None of the mentioned
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #define MIN 0
```
```
    #ifdef MIN
```
```
    #define MAX 10
```
```
    #endif
```
```
    int main()
```
```
    {
```
```
        printf("%d %d\n", MAX, MIN);
```
```
        return 0;
```
```
    }
```

a) 10 0
b) Compile time error
c) Undefined behaviour
d) None of the mentioned
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #define MIN 0
```
```
    #if defined(MIN) + defined(MAX)
```
```
    #define MAX 10
```
```
    #endif
```
```
    int main()
```
```
    {
```
```
        printf("%d %d\n", MAX, MIN);
```
```
        return 0;
```
```
    }
```

a) 10 0
b) Compile time error
c) Undefined behaviour
d) Somegarbagevalue 0
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #define MIN 0
```
```
    #if defined(MIN) - (!defined(MAX))
```
```
    #define MAX 10
```
```
    #endif
```
```
    int main()
```
```
    {
```
```
        printf("%d %d\n", MAX, MIN);
```
```
        return 0;
```
```
    }
```

a) 10 0
b) Compile time error
c) Undefined behaviour
d) Somegarbagevalue 0
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #define MIN 0
```
```
    #ifdef(MIN)
```
```
    #define MAX 10
```
```
    #endif
```
```
    int main()
```
```
    {
```
```
        printf("%d %d\n", MAX, MIN);
```
```
        return 0;
```
```
    }
```

a) 10 0
b) Compile time error
c) Run time error
d) Preprocessor error
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #define MIN 0);
```
```
    #ifdef MIN
```
```
    #define MAX 10
```
```
    #endif
```
```
    int main()
```
```
    {
```
```
        printf("%d %d\n", MAX, MIN
```
```
        return 0;
```
```
    }
```

a) 10 0
b) Compile time error due to illegal syntax for printf
c) Undefined behaviour
d) Compile time error due to illegal MIN value
View Answer

Answer: a
Explanation: None.

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