Comp Sci 2250 final

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This operator takes an operand and reverses its truth and falsehood

!

Example of a preprocessor directive

#include <iostream>

What is a literal

A literal is some data that's presented directly in the code, rather than indirectly through a variable or function call. Here are some examples, one per line:

what is the difference between an application and a utility program

Application program: Programs that allow a user to perform specific tasks on a computer - Word processing, playing a game, preparing taxes, browsing the Web, and so forth Utility program: Type of software that performs a specific task, usually related to managing or maintaining the computer system Many utilities are built into operating systems (for finding files, viewing images, backing up files, etc.)

Function prototypes are required in the language (T,F)

False

Local variables are initialized to zero by default

False

T/F the scope of a variable declared in a for loops initialization expression always extends beyond the body of the loop

False

The preprocessor executes after the compiler T/F

False

You must furnish an argument with a function call. T/F

False

What will the following code display? cout << "Four\n" << "score\n"; cout << "and" << "\nseven"; cout << "\nyears" << " ago" << endl;

Four score and seven years ago

This is a statement that causes a function to execute

Function call

What will this print if the user types John Clites<Enter>? string x; cin >> x; cout << "Hello" << setw(8) << x ;

Hello John

these are data items whose values dont change while the program is running

literals

This type of variable is defined inside a function and is not accessible outside the function.

local

--number on top

minus 1

To write data to a file you define an object of this data type

ofstream

A file must be _____ before data can be written to or read from

opened

Which statement writes the contents of number to a file Outfile

outfile << number

When a variable is assigned a number that is too large for its data type, it:

overflows

The do while loop is a _____ loop that is ideal in situations where you always what the loop to iterate at least once

post-test

A statement that starts with a # is called

preprocessor directive

This statement causes a function to end

return

number++ in cout

same number

Given the fragment below, what will happen if the user types 2<enter> and 3<enter> instead of 2 3 <enter>? int x, y; cout << "Give 2 numbers: "; cin >> x >> y; cout << x << " " << y;

same output

The _____ of a variable is limited to the block in which it is declared

scope

The ________ of a variable is limited to the block in which it is declared.

scope

This manipulator is used to establish a field width for the value immediately following it.

setw

The total number of digits that appear before and after the decimal point is sometimes referred to as:

significant digits and precision

A character literal is enclosed in ________ quotation marks, whereas a string literal is enclosed in ________ quotation marks.

single, double

In the process of translating a source file into an executable file, which of the following is the correct sequence?

source code, preprocessor, modified source code, compiler, object code, linker, executable code

a group of characters inside a set of quotation marks is called

string literal

When the final value of an expression is assigned to a variable, it will be converted to:

the data type of the variable

At the heart of a computer is its central processing unit. The CPU's job is:

to fetch instructions, to carry out the operations commanded by the instructions, to produce some outcome or resultant information.

You may define a _____ in the initialization expression for a loop

variable

When a relational expression is false, it has the value ________.

zero

When an expression is false what is its value

zero

1. Given this program, list all potential errors. #include <iostreams> int main( ) { int x, y cout >> "Give age"; cin << x; cout << "Hello" << x << end;

#include <iostreams> should be iostream using namespace std; missing int main( ) { int x, y ; missing cout >> "Give age"; use << instead of >> cin << x; opposite of above cout << "Hello" << x << end; should be endl return 0; missing

This operator represents the logical AND

&&

What will the following code display? int x = 0, y = 1, z = 2; cout << x << y << z << endl;

012

What is assigned to the variable a given the statement below with the following assumptions: x = 10, y = 7, and z, a, and b are all int variables. a = x >= y;

1

What is the output of the following statement? cout << 4 * (15 / (1 + 3)) << endl;

12

What is the value of cookies after the execution of the following statements? int number = 38, children = 4, cookies; cookies = number % children;

2

What will the value of x be after the following statements execute? int x; x = 18 % 4;

2

What will this print if the user types 3.1526 <Enter>? float x; cin >> x; cout << setprecision(2) << x << endl << fixed << x;

3.2 3.15

What will the value of x be after the following statements execute? int x; x = 18.0 / 4;

4

What will this print? int x=10; cout << sizeof(x);

4

1.What is the value of average after the following code executes? double average; average = 1.0 + 2.0 + 3.0 / 3.0;

4.0

Given the fragment below, what will happen if the user types 2 3<enter> instead of entering one number at a time? int x, y; cout << "Give first number: "; cin >> x; cout << "Give second number: "; cin >> y; cout << x << " " << y;

Before being able to enter the prompt for Give second number: 2 3 will be displayed

_____ are used to translate each source code instruction into the appropriate machine language instructions

Compilers

What are the internal parts of the cpu

Control unit and the arithmetic and logic unit

In any program that uses the cin object, you must include the ________.

iostream header file

Give examples of high level languages.

Java, C++, Pascal

What is iostream

Library for standard input/output or the header for the library

What is linker doing

Links libraries and pieces of your program

What will the following code display? cout << "Monday"; cout << "Tuesday"; cout << "Wednesday";

MondayTuesdayWednesday

The compilers main memory is known as

RAM

What does ignore(10,'\n'); do?

Skip the next 10 characters in the current input buffer, or until new line

If you need to take your program to a different computer, would you take the source or the executable?

Source if completely different computer

What will the following code display? int number = 7; cout << "The number is " << "number" << endl;

The number is number

What does the term hardware refer to

The physical components that a computer in made of

What will happen if a program attempts to open a file, for writing that doesnt exist

The system will create an empty file of the specified name, no error

Global variables are initialized to zero by default

True

In c++ key words are written in all lowercase letters T/F

True

T/F An initialization expression may be omitted from the loop if no initialization is required

True

T/F Multiple rational expressions cannot be placed in the test condition of a for loop

True

T/F The update expression of a for loop can contain more than one statement

True

You may use the exit( ) function to terminate a program, regardless of which control mechanism is executing

True

________ represent storage locations in the computers memory

Variables

++number on top

add 1

in C++ the = operator indicates

assignment

in c++ the = sign means

assignment

In c++ two slash marks // indicates

beginning of a comment

Without this statement appearing in a switch construct, the program "falls through" all of the statements below the one with the matching case expression.

break

This manipulator causes the field to be left-justified with padding spaces printed to the right.

left

A function is executed when it is

called

What does the statement dataFile.close() do

closes file

The function, pow(x, 5.0), requires this header file.

cmath

Write a statement to print: The result of 7/2 is 3.5 where 7, 2 come from integer variables x, y and 3.5 is from dividing x by y.

cout << "The result of " << x << "/" << y << " is " << static_cast<double>(x)/y;

To use the rand( ) function, you must #include this header file in your program.

cstdlib

exit() function requires which library and how many parameters does it take

cstdlib, 1

Order from top to bottom a. global variables/constants b. main function c. function prototypes d. include directives e. additional functions

d,a,c,b,e

int x=0; { cout<<"wow"; } while(x); what type of loop

definite

A function ________ contains the statements that make up the function

definition

You must have a _______ for every variable that you use in a program

definition

The programming process consists of several steps, which include

design , creation , testing , and debugging

It is a good programming practice to ________ your functions by writing comments that describe what they do

document

int x=0; while(x<0) { cout<<0; x++; } what type of loop

error

while( ) cout<<0; what type of loop

error

A variable, usually boolean or an integer that signals when a condition exists

flag

This is a variable, usually a boolean or an integer, that signals when a condition exis

flag

To allow file access in a program you must #include which header

fstream

header file included to allow file access in a program

fstream

This is a collection of statements that performs a specific task

function

An example of a secondary storage device

hard disk

Given int main() { int x=11; cout << "X is " << x << endl; return 0; } List all dentifiers: keywords: operators: manipulators: delimiters: literals:

identifiers: main x cout keywords: int operators: = << manipulators: endl delimiters: () {} ; literals: 11 "X is" 0

To read data from a file you define an object of this data type

ifstream

for (;;) cout<<"wow"; what type of loop

infinite

for (int i=0; i<10; i+1) cout<<"wow"; what type of loop

infinite

while (1) cout << "wow"; what type of loop

infinite

a for statement contains three expressions

initialization, test and update


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