Function Basics - C Programming Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Basics of Functions – 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>
```
```
    int main()
```
```
    {
```
```
        void foo();
```
```
        printf("1 ");
```
```
        foo();
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        printf("2 ");
```
```
    }
```

a) 1 2
b) Compile time error
c) 1 2 1 2
d) Depends on the compiler
View Answer

Answer: a
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        void foo(), f();
```
```
        f();
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        printf("2 ");
```
```
    }
```
```
    void f()
```
```
    {
```
```
        printf("1 ");
```
```
        foo();
```
```
    }
```

a) Compile time error as foo is local to main
b) 1 2
c) 2 1
d) Compile time error due to declaration of functions inside main
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int main()
```
```
    {
```
```
        void foo();
```
```
        void f()
```
```
        {
```
```
            foo();
```
```
        }
```
```
        f();
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        printf("2 ");
```
```
    }
```

a) 2 2
b) 2
c) Compile time error
d) Depends on the compiler
View Answer

Answer: d
Explanation: Even though the answer is 2, this code will compile fine only with gcc. GNU C supports nesting of functions in C as a language extension whereas standard C compiler doesn’t.

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

```
    #include <stdio.h>
```
```
    void foo();
```
```
    int main()
```
```
    {
```
```
        void foo();
```
```
        foo();
```
```
        return 0;
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        printf("2 ");
```
```
    }
```

a) Compile time error
b) 2
c) Depends on the compiler
d) Depends on the standard
View Answer

Answer: b
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void foo();
```
```
    int main()
```
```
    {
```
```
        void foo(int);
```
```
        foo(1);
```
```
        return 0;
```
```
    }
```
```
    void foo(int i)
```
```
    {
```
```
        printf("2 ");
```
```
    }
```

a) 2
b) Compile time error
c) Depends on the compiler
d) Depends on the standard
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    void foo();
```
```
    int main()
```
```
    {
```
```
        void foo(int);
```
```
        foo();
```
```
        return 0;
```
```
    }
```
```
    void foo()
```
```
    {
```
```
        printf("2 ");
```
```
    }
```

a) 2
b) Compile time error
c) Depends on the compiler
d) Depends on the standard
View Answer

Answer: b
Explanation: None.

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

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

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

Answer: a
Explanation: None.

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

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

a) hi
b) Compile time error
c) Nothing
d) Varies
View Answer

Answer: b
Explanation: None.

Sanfoundry Global Education & Learning Series – C Programming Language.

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