STATS 103-B

Mathematical functions - 3

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

double x=1.8; printf("%.2lf",floor(x)); 

a) 2.0

b) 2.00

c) 1.0

d) 1.00

7. double ______ (double x, double y) computes the floating-point remainder of x/y.

a) modf

b) fmod

c) ceil

d) floor

8. sqrt(x) function is not faster than the apparent equivalent pow(x,0.5).

a) true

b) false

9. Which of the given C function can be used instead of the apparent identity pointed to by y?

int x=1; double y= 0.5 * (exp (x) + exp (-x)); 

a) cos(x)

b) cosh(x)

c) fmod(x)

d) modf(x)

10. Which function is used to recombine the fraction and exponent parts of a floating-point value after you have worked on them separately?

a) frexp()

b) exp()

c) modf()

d) Idexp()

1. Which of the following statement is correct?

 double x, y, z; x = 5.123456; z= modf(x, *y); 

a) y stores integer part of x, z returns fractional part of x

b) y stores integer part of x, z returns integer part of x

c) y stores fractional part of x, z returns integer part of x

d) y stores fractional part of x, z returns fractional part of x

2. A domain error occurs if x is negative and y is not an integral value for the function pow(double x, double y).

a) true

b) false

3. A function is declared as sqrt(-x) under the header file math.h, what will the function return?

a) square root of x

b) complex number

c) domain error

d) range error

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

 double x=1.2 printf("%.1lf", ceil(x)); 

a) 1

b) 2

c) 1.0

d) 2.0

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

 double x=3,y= - 6; printf("%lf %lf", fabs(x), fabs(y)); 

a) 3 6

b) -3 6

c) 3.0 6.0

d) 3.000000 6.000000