test 1 computer science ch. 1 - 3

theDog is a valid identifier.

True

A(n) ____________________ is a location in memory, referenced by an identifier, in which a data value that can be changed is stored.

Variable

Which of the following most closely resembles human language?

a high-level language

computer

a programmable electronic device that can store, retrieve, and process data

computer program

a sequence of instructions to be performed by a computer

Algorithm

a step-by-step procedure for solving a problem in a finite amount of time

const is a valid identifier.

False. const is a reserved word

2morrow is a valid Identifier.

False. identifiers must begin with a letter or underscore.

Which one of the following is not a valid identifier in C++?

Go Home

Of the following components of a computer, which one presents the results of the processing to the outside world?

Output Device

substr

Returns a particular substring of a string

Define operating system.

The operating system manages all of the computer's resources. It can input programs, call the compiler, execute object programs, and carry out any other system commands.

DVD_ROM is a valid Identifier.

True

True or False? A C++ identifier cannot start with a digit.

True

True or False? A syntax template is a generic example of the C++ construct being defined.

True

True or False? Every C++ program must have a function named main.

True

True or False? In a computer, data is represented electronically by pulses of electricity.

True

True or False? The compiler is a program that translates a high-level language program into machine code.

True

The formal rules governing how valid instructions are written in a programming language.

syntax

In C++, the phrase "standard output device" usually refers to:

the display screen

argument list

the values in the parentheses of a function call (allows functions to communicate)

True or False? A syntax template is a generic example of the C++ construct being defined.

true

When declaring an operand such as floatPayrate, it is best to use named constants instead of literals constants because it can make your program more readable and easier to modify.

true

When dividing an integer by a float, the results are generally displayed in the form of a float if no other formatting perimeters are specified.

true

void function

A function that is called as a separate statement

elizabeth_the_2nd is a valid Identifier.

True

recycling is a valid Identifier.

True

Write a C++ program that prints out the lines of one of your favorite poems. Use a single space to separate each output line.

#include <iostream> using namespace std; int main() { cout<< "Jack and Jill went up the hill" <<endl; << "To fetch a pail of water" <<endl; << "Jack fell down and broke his crown" <<endl; << "And Jill came tumbling after" <<endl; return 0; }

What is the output of the following program fragment? (x is a float variable.) (# represents a space)x = 25.6284;cout << "**" << setw(6) << setprecision(1) << x << endl;

**##25.6

If the int variables int1 and int2 contain the values 4 and 5, respectively, then the value of the expression float(int1 / int2) is:

0.0

List the three steps in the problem-solving phase of the software life cycle.

1. Analyze the problem and specify what the solution must do 2. Develop a general solution(algorithm) to solve the problem 3. Verify that your solution really solves the problem

List the steps in the implementation phase of the software life cycle.

1. Testing your program means running(executing) your program on the computer, to see if it produces correct results 2. If it does not, then you must find out what is wrong with your program or algorithm and fix it--this is called debugging

Given the declaration statement and statement float someFloat; someFloat = 12; cout << someFloat what will be the value and output of someFloat?

12

Given that x is a float variable and num is an int variable containing the value 38, what will x contain after execution of the following statement: x = num / 4 + 3.0;

12.0

Given that x is a float variable and num is an int variable containing the value 5, what will x contain after execution of the following statement: x = num + 2;

7.0

What is the output of the following program fragment?cout << "Barrel" << endl;cout << ' ';cout << "of";cout << "Laughs" << endl;

Barrel ofLaughs

page# is a valid Identifier.

False

True or False? A literal string can continue onto more than one line, as long as it is enclosed in double quotes.

False

True or False? An assembler is a program that translates an assembly language program into a high-level language.

False

True or False? Some C++ reserved words can also be used as programmer-defined identifiers.

False

True or False? The term software refers to the physical components of a computer.

False

True or False? There is only one unique general solution (algorithm) for a given problem.

False

all-In- One is a valid identifier.

False

at

access characters directly by their positions

unary operator

an operator with just one operand

binary operator

an operator with two operands

information

any knowledge that can be communicated

Inside a computer, a single character such as the letter A usually is represented by a:

byte

A programming language is said to be ____________________ if it considers uppercase letters to be different from lowercase letters.

case-sensitive

integer

char, short, bool

A(n) ____________________ is a program that translates a high-level language program into machine code.

compiler

Of the following components of a computer, which one assures that program instructions are executed in the proper sequence?

control unit

setw

controls how many character positions the next data item should occupy when it is outputted

set precision

controls the number of decimal places (numbers to the right of the decimal point)

A specific set of values, along with operations that can be applied to those values.

data type

The process of determining the cause of an error in a program and correcting the error is called ____________________.

debugging

A(n) ____________________ is a statement that associates an identifier with a data object, a function, or a data type so that the programmer can refer to that item by name.

declaration

cctype

directive used to call toupper and tolower functions

float

double, double long

type casting

explicitly changing a value of one type into another

An arrangement of identifiers, literals, and operators that can be evaluated.

expression

C++ operand

expression or values on which an operator operates or works often constants or variables

In C++, subprograms are referred to as ____________________.

functions

showpoint

generally forces decimal points for general output

In C++ systems, names appearing in #include directives are called ____________________ files.

header

A name that is used to refer to a function or data object.

identifier

type coercion

implicitly changing a value of one type into another

Where can C++ comments appear in a computer program?

in constant and variable declarations

data

information in a form a computer can use

Any constant value written in a program is called a(n) ____________________ value.

literal

____________________ is the language made up of binary-coded instructions that are used directly by the computer.

machine language

Which problem-solving technique involves defining the beginning and ending states of a problem, then comparing different methods for getting between the states?

means-ends analysis

A language that is used to write the rules for another language

metalanguage

An identifier referring to a value that cannot be changed.

named constant

A(n) ____________________ is an input, output, or auxiliary storage device attached to a computer. It is a device that connects to the system unit and is controlled by the processor in the computer

peripheral device

programming

planning or scheduling the performance of a task or an event

A(n) ____________________ is a set of rules, symbols, and special words used to construct a computer program.

programming language

length/size

returns an integer value equal to the number of characters in the string

find

returns an integer value of the first occurrence of a particular substring

The set of rules that determines the meaning of instructions written in a programming language.

semantics

Which assignment statement could be used to store the letter A into the char variable someChar?

someChar = 'A';

fixed

specifically forces decimal formatted output when scientific E notation would have been the output