Computer Programming Final

____ is a valid char value. "A" "-129" 129 'A'

'A'

Suppose that ch1, ch2, and ch3 are variables of the type char and the input is: A B C Choose the value of ch3 after the following statement executes: cin >> ch1 >> ch2 >> ch3; 'A' 'B' '\n' 'C'

'C'

The expression static_cast<int>(6.9) + static_cast<int>(7.9) evaluates to ____.

13

The length of the string "computer science" is ____.

16

Suppose that count is an int variable and count = 1. After the statement count++; executes, the value of count is ____.

2

The value of the expression 17 % 7 is ____.

3

The value of the expression 33/10, assuming both values are integral data types, is ____.

3

Suppose that alpha, beta, and gamma are int variables and the input is: 100 110 120 200 210 220 300 310 320 What is the value of gamma after the following statements execute? cin >> alpha; cin.ignore(100, '\n'); cin >> beta; cin.ignore(100,'\n'); cin >> gamma;

300

____ is a valid int value. -32.00 46,259 46259 462.59

46259

The expression static_cast<int>(9.9) evaluates to ____.

9

Which example illustrates how a class can be used as an abstraction?

A programmer creates a class to handle a recognized pattern of repetitive social media login credential items.

Suppose that alpha and beta are int variables. The statement alpha = beta--; is equivalent to the statement(s) ____. A. alpha = beta; beta = beta - 1; B. beta = beta - 1; alpha = beta; C. alpha = 1 - beta; D. alpha = beta - 1;

A. alpha = beta; beta = beta - 1;

Suppose that x and y are int variables. Which of the following is a valid input statement? A. cin >> x >> y; B. cout << x << y; C. cin >> x >> cin >> y; D. cin << x << y;

A. cin >> x >> y;

Suppose that x is an int variable, y is a double variable, z is an int variable, and the input is: 15 76.3 14 Choose the values after the following statement executes: cin >> x >> y >> z; A. x = 15, y = 76.3, z = 14 B. x = 15, y = 76, z = 14 C. x = 15, y = 76, z = 0 D. x = 15.0, y = 76.3, z = 14.0

A. x = 15, y = 76.3, z = 14

Which example illustrates how abstraction can help identify variables?

Abstraction can be used in pattern recognition to identify possible variables.

What statement describes how dependencies and cohesion relate to decomposition?

An effective breakdown minimizes dependencies and maximizes cohesion among the various parts.

____ programs perform a specific task.

Application

Suppose that alpha and beta are int variables. The statement alpha = ++beta; is equivalent to the statement(s) ____. A. alpha = alpha + beta; B. beta = beta + 1; alpha = beta; C. alpha = beta; beta = beta + 1; D. alpha = beta + 1;

B. beta = beta + 1; alpha = beta;

Suppose that x is an int variable, y is a double variable and ch is a char variable and the input is:15A 73.2Choose the values after the following statement executes: cin >> x >> ch >> y; A. x = 15, ch = 'A', y = 73.0 B. x = 15, ch = 'A', y = 73.2 C. This statement results in an error because there is no space between 15 and A. D. x = 15, ch = 'a', y = 73.0

B. x = 15, ch = 'A', y = 73.2

Why are computer scientists interested in algorithm efficiency?

Because efficient algorithms tend to produce computer programs that in turn operate efficiently, quickly, and reliably.

The programming language C++ evolved from ____.

C

Choose the output of the following C++ statement: cout << "Sunny " << '\n' << "Day " << endl; A. Sunny \nDay B. Sunny \nDay endl C. Sunny Day D. Sunny \n Day

C. Sunny Day

Suppose that alpha and beta are int variables. The statement alpha = beta++; is equivalent to the statement(s) ____. A. alpha = 1 + beta; B. alpha = alpha + beta; C. alpha = beta; beta = beta + 1; D. beta = beta + 1; alpha = beta;

C. alpha = beta; beta = beta + 1;

Suppose that alpha and beta are int variables. The statement alpha = --beta; is equivalent to the statement(s) ____. A. alpha = beta; beta = beta - 1; B. alpha = 1 - beta; C. beta = beta - 1; alpha = beta; D. alpha = beta - 1;

C. beta = beta - 1; alpha = beta;

The declaration int a, b, c; is equivalent to which of the following? A. int abc; B. int a b c; C. int a,b,c; D. inta , b, c;

C. int a,b,c;

Suppose that x and y are int variables, z is a double variable, and the input is: 28 32.6 12 Choose the values of x, y, and z after the following statement executes: cin >> x >> y >> z; A. x = 28, y = 32, z = 12.0 B. x = 28, y = 12, z = 32.6 C. x = 28, y = 32, z = 0.6 D. .x = 28, y = 12, z = 0.6

C. x = 28, y = 32, z = 0.6

The ____ is the brain of the computer and the single most expensive piece of hardware in your personal computer.

CPU

In a C++ program, one and two are double variables and input values are 10.5 and 30.6. After the statement cin >> one >> two; executes, ____. A. one = 10.5, two = 10.5 B. one = 11, two = 31 C. one = 30.6, two = 30.6 D. one = 10.5, two = 30.6

D. one = 10.5, two = 30.6

____ represent information with a sequence of 0s and 1s.

Digital signals

A comma is also called a statement terminator.

False

A mixed arithmetic expression contains all operands of the same type.

False

An operator that has only one operand is called a unique operator.

False

C++ programs have always been portable from one compiler to another.

False

If input failure occurs in a C++ program, the program terminates immediately and displays an error message.

False

In C++, reserved words are the same as predefined identifiers.

False

In the statement cin >> x;, x can be a variable or an expression.

False

The device that stores information permanently (unless the device becomes unusable or you change the information by rewriting it) is called primary storage.

False

The devices that feed data and programs into computers are called output devices.

False

The escape sequence \r moves the insertion point to the beginning of the next line.

False

The following statements will result in input failure if the input values are not on a separate line. (Assume that x and y are int variables.) cin >> x; cin >> y;

False

When the computer is turned off, everything in secondary memory is lost.

False

When you compile your program, the compiler identifies the logic errors and suggests how to correct them.

False

Consider the following code. // Insertion Point 1 using namespace std; const float PI = 3.14; int main(){ // Insertion Point 2 float r = 2.0; float area; area = PI * r * r; cout << "Area = " << area << endl; return 0;} // Insertion Point 3 In this code, where does the include statement belong?

Insertion Point 1

Why is decomposition an important tool for computer scientists?

It creates algorithm designs with more manageable pieces, leading to programs that are more efficient and maintainable.

Which statement best describes a computer program?

It is a set of instructions that performs a specific task when executed by a digital device.

Which statement describes how the black box concept is an implementation of abstraction?

It produces an output while hiding the inner workings of a process.

Which statement describes why abstraction is an important computer science concept?

It provides a means to hide implementation details from the user to simplify subsequent development and promotes software reuse.

____ are executable statements that inform the user what to do.

Prompt lines

What characteristic best applies to an effective algorithm?

The algorithm produces one or more outputs.

Which example leads to an algorithm design used for an everyday technology application?

The payment process at an online store

Suppose that x and y are int variables, ch is a char variable, and the input is:4 2 A 12Choose the values of x, y, and ch after the following statement executes:cin >> x >> ch >> y; x = 4, ch = 2, y = 12 x = 4, ch = ' ', y = 2 x = 4, ch = A, y = 12 This statement results in input failure

This statement results in input failure

If a C++ arithmetic expression has no parentheses, operators are evaluated from left to right.

True

Suppose a = 5. After the execution of the statement ++a; the value of a is 6.

True

Suppose we declare a variable sum as an int. The statement "sum += 7;" is equivalent to the statement "sum = sum + 7;".

True

The basic commands that a computer performs are input (get data), output (display result), storage, and performance of arithmetic and logical operations.

True

The maximum number of significant digits in values of the double type is 15.

True

To develop a program to solve a problem, you start by analyzing the problem.

True

You can use the function getline to read a string containing blanks.

True

____ consists of 65,536 characters.

Unicode

Suppose that ch1 and ch2 are char variables and the input is: WXYZ What is the value of ch2 after the following statements execute?cin.get(ch1); cin.putback(ch1); cin >> ch2;

W

Suppose that ch1 and ch2 are char variables and the input is: WXYZ What is the value of ch2 after the following statements execute? cin >> ch1; ch2 = cin.peek(); cin >> ch2;

X

Which of the following is the newline character? \l \n \b \r

\n

Which term refers to a technique that hides details, simplifies complexity, and substitutes a generalization for something specific?

abstraction

A step-by-step problem-solving process in which a solution is arrived at in a finite amount of time is called a(n) ____.

algorithm

Which term refers to a series of steps for solving a problem or carrying out a task?

algorithm

Which idea represents an example of a repetitive pattern?

allowing three password entry attempts before locking a user out of an online account

Suppose that alpha is an int variable and ch is a char variable and the input is: 17 A What are the values after the following statements execute? cin >> alpha; cin >> ch; alpha = 1, ch = 7 alpha = 17, ch = ' ' alpha = 17, ch = 'A' alpha = 17, ch = 'a'

alpha = 17, ch = 'A'

Suppose that alpha and beta are int variables and alpha = 5 and beta = 10. After the statement alpha *= beta; executes, ____. alpha = 50 alpha = 50.0 alpha = 5 alpha = 10

alpha = 50

The digit 0 or 1 is called a binary digit, or ____.

bit

Which phase describes an example of functional decomposition?

breaking down a two-factor authentication module into smaller actions, processes, or steps

A sequence of eight bits is called a ____.

byte

Which of the following is a reserved word in C++? CHAR character Char char

char

A program called a(n) ____ translates instructions written in high-level languages into machine code.

compiler

What concept refers to a set of techniques designed to formulate problems and their solutions so that a programmer can select efficient algorithms?

computational thinking

What term refers to the process of dividing an extensive app into smaller parts?

decomposition

Which phrase describes an example of structural decomposition?

dividing a mobile banking app into hierarchical structural units

An example of a floating point data type is ____. double short int char

double

The memory allocated for a float value is ____ bytes.

four

The term GB refers to ____.

gigabyte

The devices that feed data and programs into computers are called ____ devices.

input

The basic commands that a computer performs are ____, and performance of arithmetic and logical operations.

input, output, storage

Manipulators without parameters are part of the ____ header file.

iostream

A program called a(n) ____ combines the object program with the programs from libraries.

linker

A program that loads an executable program into main memory is called a(n) ____.

loader

Which phrase describes an example of object-oriented decomposition?

looking for two-factor authentication logical and physical objects that a computer program will manipulate

Several categories of computers exist, such as ____.

mainframe, midsize, and micro

Main memory is an ordered sequence of items, called ____.

memory cells

A(n) ____ consists of data and the operations on those data.

object

The devices that the computer uses to display results are called ____ devices.

output

Which term refers to the process of finding similarities in procedures and tasks?

pattern identification

Which of the following is a legal identifier? program_1 1program program! program 1

program_1

Main memory is called ____.

random access memory

____ is a parameterized stream manipulator.

setfill

Dividing a problem into smaller subproblems is called ____ design.

structured

Suppose that sum and num are int variables and sum = 5 and num = 10. After the statement sum += num executes, ____. sum = 15 sum = 0 sum = 10 sum = 5

sum = 15

The ____ rules of a programming language tell you which statements are legal, or accepted, by the programming language.

syntax

Information stored in main memory must be transferred to some other device for permanent storage.

true

The maximum number of significant digits in float values is up to 6 or 7.

true

What phrase identifies an example of single classification of objects from a classification pattern?

vehicles represented as cars