Conditional Inclusion - C Language Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Conditional Inclusion – 1”.

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

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

```
    #include <stdio.h>
```
```
    #define SYSTEM 20
```
```
    int main()
```
```
    {
```
```
        int a = 20;
```
```
        #if SYSTEM == a
```
```
        printf("HELLO ");
```
```
        #endif
```
```
        #if SYSTEM == 20
```
```
        printf("WORLD\n");
```
```
        #endif
```
```
    }
```

a) HELLO
b) WORLD
c) HELLO WORLD
d) No Output
View Answer

Answer: b
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    #define Cprog
```
```
    int main()
```
```
    {
```
```
        int a = 2;
```
```
        #ifdef Cprog
```
```
        a = 1;
```
```
        printf("%d", Cprog);
```
```
    }
```

a) No output on execution
b) Output as 1
c) Output as 2
d) Compile time error
View Answer

Answer: d
Explanation: None.

3. The “else if” in conditional inclusion is written by?
a) #else if
b) #elseif
c) #elsif
d) #elif
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #define COLD
```
```
    int main()
```
```
    {
```
```
        #ifdef COLD
```
```
        printf("COLD\t");
```
```
        #undef COLD
```
```
        #endif
```
```
        #ifdef COLD
```
```
        printf("HOT\t");
```
```
        #endif
```
```
    }
```

a) HOT
b) COLD
c) COLD HOT
d) No Output
View Answer

Answer: b
Explanation: None.

5. Which of the following sequences are unaccepted in C language?
a)

   #if
   #else
   #endif

   #if
   #elif
   #endif

   #if
   #if
   #endif

   #if
   #undef
   #endif

View Answer

Answer: c
Explanation: None.

6. In a conditional inclusion, if the condition that comes after the if is true, then what will happen during compilation?
a) Then the code up to the following #else or #elif or #endif is compiled
b) Then the code up to the following #endif is compiled even if #else or #elif is present
c) Then the code up to the following #eliif is compiled
d) None of the mentioned
View Answer

Answer: a
Explanation: None.

7. Conditional inclusion can be used for ___________
a) Preventing multiple declarations of a variable
b) Check for existence of a variable and doing something if it exists
c) Preventing multiple declarations of same function
d) All of the mentioned
View Answer

Answer: d
Explanation: None.

8. The #elif directive cannot appear after the preprocessor #else directive.
a) True
b) False
View Answer

Answer: a
Explanation: None.

Sanfoundry Global Education & Learning Series – C Programming Language.

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