Unit 4 Opener - Predefined Functions & Casting

Which include directive is necessary to use the pow and sqrt functions?

• #include<math>

• #include<cmath>

• #include<cstdlib>

• #include<mathlibrary>

What is the value of the expression below?

ceil(10.2)

• 10.0

• 10.2

• 11.0

What is the value of the expression below?

floor(99.9)

• 100.0

• 99.0

• 99.9

What is the output from the code segment below?

int x = 7;

int y = 2;

double q = x / y;

cout << q;

• 3.5

• 3

• 4

What is the output from the code segment below?

int x = 7;

int y = 2;

double q = (double) x / y;

cout << q;

• 3.5

• 3

• 4

What is the output from the code segment below?

double y = 12.3;

int x = (int) (y + 0.5);

cout << x;

• 12.8

• 13

• 12

What is the output from the code segment below?

double y = 89.7;

int x = (int) (y + 0.5);

cout << x;

• 90.2

• 90

• 89

Translate the mathematical expression below to C++.

 $\sqrt{x^3-\left(z+y\right)^2}$  

• sqrt(x^3 - (z+y)^2)

• sqrt(pow(x, 3) - pow(z+y, 2))

• sqrt(pow(3, x) - (z+y)*(z+y))

• sqrt(x^3 - pow(z +y),2)