Chapter 1: C++ Fundamentals Test

Front 1

It has been said that C++ sits at the center of the modern programming universe. Explain this
statement.

Back 1

C++ is at the center of modern programming because it was derived from C and is the parent of Java and C#. These are the four most important programming languages.

Front 2

A C++ compiler produces object code that is directly executed by the computer. True or false?

Back 2

True, a C++ compiler produces code that can be directly executed by the computer.

Front 3

What are the three main principles of object-oriented programming?

Back 3

Encapsulation, polymorphism, and inheritance are the three guiding principles of OOP.

Front 4

Where do C++ programs begin execution?

Back 4

C++ programs begin execution at main( ).

Front 5

What is a header?

Back 5

A header contains information used by the program.

Front 6

What is <iostream>? What does the following code do?

#include <iostream>

Back 6

<iostream> is the header the supports I/O. The statement includes the <iostream> header in a program.

Front 7

What is a namespace?

Back 7

A namespace is a declarative region in which various program elements can be placed. Elements declared in one namespace are separate from elements declared in another.

Front 8

What is a variable?

Back 8

A variable is a named memory location. The contents of a variable can be changed during the execution of a program.

Front 9

Which of the following variable names is/are invalid?

a. count

b. _count

c. count27

d. 67count

e. if

Back 9

The invalid variables are d and e. Variable names cannot begin with a digit or be the same as a C++ keyword.

Front 10

How do you create a single-line comment? How do you create a multiline comment?

Back 10

A single-line comment begins with // and ends at the end of the line. A multiline comment begins with /* and ends with */.

Front 11

Show the general form of the if statement. Show the general form of the for loop.

Back 11

The general form of the if:
if(condition) statement; The general form of the for: for(initialization; condition; increment) statement;

Front 12

How do you create a block of code?

Back 12

A block of code is started with a { and ended with a }.

Front 13

The moon’s gravity is about 17 percent that of Earth’s. Write a program that displays a table that shows Earth pounds and their equivalent moon weight. Have the table run from 1 to 100 pounds. Output a newline every 25 pounds.

Back 13

// Show a table of Earth to Moon weights.

#include <iostream>
using namespace std;

int main() {

double earthweight; // weight on earth
double moonweight; // weight on moon
int counter;

counter = 0;
for(earthweight = 1.0; earthweight <= 100.0; earthweight++) {
moonweight = earthweight * 0.17;
cout << earthweight << " earth-pounds is equivalent to " << moonweight << " moon-pounds.\n";
counter++
if(counter == 25) {
cout << "\n";
counter = 0;
}
}

return 0;
}

Front 14

A year on Jupiter (the time it takes for Jupiter to make one full circuit around the Sun) takes about 12 Earth years. Write a program that converts Jovian years to Earth years. Have the user specify the number of Jovian years. Allow fractional years.

Back 14

// Convert Jovian years to Earth years.

#include <iostream>
using namespace std;

int main() {
double e_years; // earth years
double j_years; // Jovian years

cout << "Enter number of Jovian years: ";
cin >> j_years;

e_years = j_years * 12.0;

cout << "Equivalent Earth years: " << e_years;

return 0;
}

Front 15

When a function is called, what happens to program control?

Back 15

When a function is called, program control transfers to that function.

Front 16

Write a program that averages the absolute value of five values entered by the user. Display the result.

Back 16

// Average the absolute values of 5 numbers.

#include <iostream>
#include <cstdlib>
using namespace std;

int main()
{
int i;
double avg, val;

avg = 0.0;

for(i=0; i<5; i++) {
cout << "Enter a value: ";
cin >> val;

avg = avg + abs(val);
}
avg = avg / 5;

cout << "Average of absolute values: " << avg;

return 0;
}