250+ TOP MCQs on Variable Length Argument and Answers [2024]

C helps anyone preparing for Toshiba and other companies C interviews. One should practice these Objective Questions and answers continuously for 2-3 months to clear Toshiba interviews on C Programming language.

Here is a listing of C Objective Questions on “Variable Length Argument” along with answers, explanations and/or solutions:

1. The standard header _______ is used for variable list arguments (…) in C.
a)
b)
c)
d)
Answer: d
Clarification: 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
Answer: c
Clarification: None.

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

```
    #include 
```
```
    int f(char chr, ...);
```
```
    int main()
```
```
    {
```
```
        char c = 97;
```
```
        f(c);
```
```
        return 0;
```
```
    }
```
```
    int f(char c, ...)
```
```
    {
```
```
        printf("%cn", c);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) 97
d) a
Answer: d
Clarification: None.

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

```
    #include 
```
```
    #include 
```
```
    int f(...);
```
```
    int main()
```
```
    {
```
```
        char c = 97;
```
```
        f(c);
```
```
        return 0;
```
```
    }
```
```
    int f(...)
```
```
    {
```
```
        va_list li;
```
```
        char c = va_arg(li, char);
```
```
        printf("%cn", c);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) 97
d) a
Answer: a
Clarification: None.

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

```
    #include 
```
```
    #include 
```
```
    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("%cn", d);
```
```
        va_end(li);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) a
d) b
Answer: b
Clarification: None.

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

```
    #include 
```
```
    #include 
```
```
    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("%cn", d);
```
```
        va_end(li);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) a
d) b
Answer: d
Clarification: None.

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

```
    #include 
```
```
    #include 
```
```
    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("%fn", d);
```
```
        va_end(li);
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) 97.000000
d) 98.000000
Answer: b
Clarification: None.

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