Variable Length Argument Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Variable Length Argument – 2”.

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

1. The standard header _______ is used for variable list arguments (…) in C.
a) <stdio.h >
b) <stdlib.h>
c) <math.h>
d) <stdarg.h>
View Answer

Answer: d
Explanation: None.

2. What is the purpose of va_end?
a) Cleanup is necessary
b) Must be called before the program returns
c) Cleanup is necessary & Must be called before the program returns
d) None of the mentioned
View Answer

Answer: c
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int f(char chr, ...);
```
```
    int main()
```
```
    {
```
```
        char c = 97;
```
```
        f(c);
```
```
        return 0;
```
```
    }
```
```
    int f(char c, ...)
```
```
    {
```
```
        printf("%c\n", c);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) 97
d) a
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #include <stdarg.h>
```
```
    int f(...);
```
```
    int main()
```
```
    {
```
```
        char c = 97;
```
```
        f(c);
```
```
        return 0;
```
```
    }
```
```
    int f(...)
```
```
    {
```
```
        va_list li;
```
```
        char c = va_arg(li, char);
```
```
        printf("%c\n", c);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) 97
d) a
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #include <stdarg.h>
```
```
    int f(char c, ...);
```
```
    int main()
```
```
    {
```
```
        char c = 97, d = 98;
```
```
        f(c, d);
```
```
        return 0;
```
```
    }
```
```
    int f(char c, ...)
```
```
    {
```
```
        va_list li;
```
```
        va_start(li, c);
```
```
        char d = va_arg(li, char);
```
```
        printf("%c\n", d);
```
```
        va_end(li);
```
```
    }
```

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

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #include <stdarg.h>
```
```
    int f(char c, ...);
```
```
    int main()
```
```
    {
```
```
        char c = 97, d = 98;
```
```
        f(c, d);
```
```
        return 0;
```
```
    }
```
```
    int f(char c, ...)
```
```
    {
```
```
        va_list li;
```
```
        va_start(li, c);
```
```
        char d = va_arg(li, int);
```
```
        printf("%c\n", d);
```
```
        va_end(li);
```
```
    }
```

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

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #include <stdarg.h>
```
```
    int f(int c, ...);
```
```
    int main()
```
```
    {
```
```
        int c = 97;
```
```
        float d = 98;
```
```
        f(c, d);
```
```
        return 0;
```
```
    }
```
```
    int f(int c, ...)
```
```
    {
```
```
        va_list li;
```
```
        va_start(li, c);
```
```
        float d = va_arg(li, float);
```
```
        printf("%f\n", d);
```
```
        va_end(li);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) 97.000000
d) 98.000000
View Answer

Answer: b
Explanation: None.

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