C Programming Multiple Choice Questions and Answers on Mathematical Functions for Freshers

1. What is the output of this C code?

1.     #include 

2.     #include 

3.     int main()

4.     {

5.         int i = 90;

6.         printf("%f\n", sin(i));

7.         return 0;

8.     }

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

Answer: a

2. What is the output of this C code?

1.     #include 

2.     #include 

3.     int main()

4.     {

5.         unsigned int i = -1;

6.         printf("%f\n", fabs(i));

7.         return 0;

8.     }

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

Answer: d

3. function fabs defined math.h header file takes argument of type integer.

a) True
b) False
c) Depends on the implementation
d) Depends on the standard

Answer: b

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

Answer: a

5. What is the output of this C code?

1.     #include 

2.     #include 

3.     int main()

4.     {

5.         int i = 10;

6.         printf("%f\n", log10(i));

7.         return 0;

8.     }

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

Answer: b

6. What type of inputs are accepted by mathematical functions?

a) short
b) int
c) float
d) double

Answer: d

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

Answer: d

8. Which of the following is not a valid mathematical function?

a) frexp(x);
b) atan2(x,y);
c) srand(x);
d) fmod(x);

Answer: d

9. Which of the following mathematical function requires 2 parameter for successful function call?

a) fmod();
b) div();
c) atan2();
d) all of the mentioned

Answer: d

10. Which mathematical function among the following does NOT require int parameters?

a) div(x, y);
b) srand(x);
c) sqrt(x);
d) all of the mentioned

Answer: c

11. sin(x) returns

a) sine of x where x is in radians
b) sine of x where x is in degree
c) cosine of x where x is in radians
d) cosine of x where x is in degree

Answer: a

12. cos(x) returns

a) sine of x where x is in radians
b) sine of x where x is in degree
c) cosine of x where x is in radians
d) cosine of x where x is in degree

Answer: c

13. What is the output of this C code?

1.     #include 

2.     #include 

3.     void main()

4.     {

5.         int k = pow(2, 3);

6.         printf("%d\n", k);

7.     }

a) 9
b) 8
c) -1
d) 6

Answer: b

14. What is the output of this C code?

1.     #include 

2.     #include 

3.     void main()

4.     {

5.         int k = fabs(-87);

6.         printf("%d\n", k);

7.     }

a) -87
b) 87
c) 78
d) error

Answer: b

15. What is the output of this C code?

1.     #include 

2.     #include 

3.     void main()

4.     {

5.         int k = sqrt(-4);

6.         printf("%d\n", k);

7.     }

a) -2
b) 2
c) Compile time error
d) NaN

Answer: d

16. Which among the following mathematical function do not have a “double” return-type?

a) srand(x);
b) ceil(x);
c) floor(x);
d) both ceil(x); and floor(x);

Answer: a