Functions Returning Non-integers - C Programming Questions and Answers

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Functions Returning Non-integers – 1”.

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

1. What is the return-type of the function sqrt()?
a) int
b) float
c) double
d) depends on the data type of the parameter
View Answer

Answer: c
Explanation: None.

2. Which of the following function declaration is illegal?
a)

   double func();
   int main(){}
   double func(){}

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   double func(){};
   int main(){}

   int main()
   {
       double func();
   }
   double func(){//statements}

d) None of the mentioned
View Answer

Answer: d
Explanation: None.

3. What will be the output of the following C code having void return-type function?

```
    #include <stdio.h>
```
```
    void foo()
```
```
    {
```
```
        return 1;
```
```
    }
```
```
    void main()
```
```
    {
```
```
        int x = 0;
```
```
        x = foo();
```
```
        printf("%d", x);
```
```
    }
```

a) 1
b) 0
c) Runtime error
d) Compile time error
View Answer

Answer: d
Explanation: None.

4. What will be the data type returned for the following C function?

```
    #include <stdio.h>
```
```
    int func()
```
```
    {
```
```
        return (double)(char)5.0;
```
```
    }
```

a) char
b) int
c) double
d) multiple type-casting in return is illegal
View Answer

Answer: b
Explanation: None.

5. What is the problem in the following C declarations?

   int func(int);
   double func(int);
   int func(float);

a) A function with same name cannot have different signatures
b) A function with same name cannot have different return types
c) A function with same name cannot have different number of parameters
d) All of the mentioned
View Answer

Answer: d
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int m()
```
```
    {
```
```
        printf("hello");
```
```
    }
```
```
    void main()
```
```
    {
```
```
        int k = m();
```
```
        printf("%d", k);
```
```
    }
```

a) hello5
b) Error
c) Nothing
d) Junk value
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int *m()
```
```
    {
```
```
        int *p = 5;
```
```
        return p;
```
```
    }
```
```
    void main()
```
```
    {
```
```
        int *k = m();
```
```
        printf("%d", k);
```
```
    }
```

a) 5
b) Junk value
c) 0
d) Error
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    int *m();
```
```
    void main()
```
```
    {
```
```
        int *k = m();
```
```
        printf("hello ");
```
```
        printf("%d", k[0]);
```
```
    }
```
```
    int *m()
```
```
    {
```
```
        int a[2] = {5, 8};
```
```
        return a;
```
```
    }
```

a) hello 5 8
b) hello 5
c) hello followed by garbage value or runtime error
d) Compilation error
View Answer

Answer: c
Explanation: Since are returning the address of a local array variable ‘a’, the compiler will give a warning in most of the cases. However, the program will run, but it will result in unexpected behaviour. In most of the compilers, it will result in a core dump due to segmentation fault whereas in some compilers, it might print hello followed by garbage value.

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