Mathematical Functions - C Language Questions and Answers

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

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>
```
```
    #include <math.h>
```
```
    int main()
```
```
    {
```
```
        int i = 90;
```
```
        printf("%f\n", sin(i));
```
```
        return 0;
```
```
    }
```

a) Compile time error
b) Undefined behaviour
c) 0.893997
d) 1.000000
View Answer

Answer: c
Explanation: None.

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

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```
    #include <stdio.h>
```
```
    #include <math.h>
```
```
    int main()
```
```
    {
```
```
        unsigned int i = -1;
```
```
        printf("%f\n", fabs(i));
```
```
        return 0;
```
```
    }
```

a) Compile time error
b) 1
c) -1
d) None of the mentioned
View Answer

Answer: d
Explanation: None.

3. function fabs defined math.h header file takes the argument of type integer.
a) True
b) False
c) Depends on the implementation
d) Depends on the standard
View Answer

Answer: b
Explanation: None.

4. log(x) function defined in math.h header file is __________
a) Natural base logarithm
b) Logarithm to the base 2
c) Logarithm to the base 10
d) None of the mentioned
View Answer

Answer: a
Explanation: None.

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

```
    #include <stdio.h>
```
```
    #include <math.h>
```
```
    int main()
```
```
    {
```
```
        int i = 10;
```
```
        printf("%f\n", log10(i));
```
```
        return 0;
```
```
    }
```

a) Compile time error
b) 1.000000
c) 2.302585
d) None of the mentioned
View Answer

Answer: b
Explanation: None.

6. What type of inputs are accepted by mathematical functions?
a) short
b) int
c) float
d) double
View Answer

Answer: d
Explanation: None.

7. In linux, apart from including math header file, the program is successfully executed by which of the following?
a) cc filename.c
b) cc filename.c -lc
c) cc -math filename.c
d) cc -lm filename.c
View Answer

Answer: d
Explanation: None.

8. Which of the following is not a valid mathematical function?
a) frexp(x);
b) atan2(x,y);
c) srand(x);
d) fmod(x);
View Answer

Answer: d
Explanation: None.

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