C Questions and Answers – Mathematical Functions – 2

This set of C Multiple Choice Questions & Answers (MCQs) focuses on “Mathematical Functions – 2”.

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

1. What does the given C code do?

double atan2 (double y, double x);

a) The atan2 function returns the arc tangent of x/y
b) The atan2 function returns the arc tangent of x
c) The atan2 function returns the arc tangent of y/x
d) The atan2 function returns the arc tangent of y
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2. The cos function computes the cosine of x.
a) measured in radians
b) measured in degrees
c) measured in gradian
d) measured in milliradian
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3. The function computes the hyperbolic cosine of x.
a) cos(x)
b) cosine(x)
c) cosh(x)
d) cosineh(x)
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4. What error occurs if the magnitude of x is too large in sinh(double x)?
a) domain error
b) range error
c) no error
d) zero is returned
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5. Which of the following is the correct code?
a) tanh(double x)
b) tanh double x
c) tanhdouble x
d) tanhdoublex
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6. Name the function that breaks a floating-point number into a normalized fraction and an integral power of 2.
a) exp()
b) frexp()
c) Idexp()
d) modf()
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7. The function computes the exponential function of x.
a) exp(x)
b) frexp(x)
c) frexp x
d) exp x
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8. The ldexp() function multiplies a floating-point number by an integral power of 2.
a) true
b) false
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9. What will be the output of the following C code?

double log (double -x);

a) returns natural logarithm of x
b) range error
c) domain error
d) returns natural logarithm of -x
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10. Which of the given function is a library function under the header math.h?
a) log10()
b) log20()
c) log30()
d) log50()
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