Macro Substitution Directives in C Questions and Answers

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

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>
```
```
    void main()
```
```
    {
```
```
        #define max 37;
```
```
        printf("%d", max);
```
```
    }
```

a) 37
b) Compile time error
c) Varies
d) Depends on compiler
View Answer

Answer: b
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        #define max 37
```
```
        printf("%d", max);
```
```
    }
```

a) 37
b) Run time error
c) Varies
d) Depends on compiler
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        #define const int
```
```
        const max = 32;
```
```
        printf("%d", max);
```
```
    }
```

a) Run time error
b) 32
c) int
d) const
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void main()
```
```
    {
```
```
        #define max 45
```
```
        max = 32;
```
```
        printf("%d", max);
```
```
    }
```

a) 32
b) 45
c) Compile time error
d) Varies
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    # define max
```
```
    void m()
```
```
    {
```
```
        printf("hi");
```
```
    }
```
```
    void main()
```
```
    {
```
```
        max;
```
```
        m();
```
```
    }
```

a) Run time error
b) hi hi
c) Nothing
d) hi
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #define A 1 + 2
```
```
    #define B 3 + 4
```
```
    int main()
```
```
    {
```
```
        int var = A * B;
```
```
        printf("%d\n", var);
```
```
    }
```

a) 9
b) 11
c) 12
d) 21
View Answer

Answer: b
Explanation: None.

7. Which of the following Macro substitution are accepted in C?
a)

   #define A #define
   A VAR 20

   #define A define
   #A VAR 20

   #define #A #define
   #A VAR 20

d) None of the mentioned
View Answer

Answer: d
Explanation: None.

8. Comment on the output of the following C code.

```
    #include <stdio.h>
```
```
    #define var 20);
```
```
    int main()
```
```
    {
```
```
        printf("%d\n", var
```
```
    }
```

a) No errors, it will show the output 20
b) Compile time error, the printf braces aren’t closed
c) Compile time error, there are no open braces in #define
d) None of the mentioned
View Answer

Answer: a
Explanation: None.

9. Which of the following properties of #define is not true?
a) You can use a pointer to #define
b) #define can be made externally available
c) They obey scope rules
d) All of the mentioned
View Answer

Answer: d
Explanation: None.

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