A Quick Look at C++

A simple and basic C++ code example. Explore your logical understanding of programming wither you are a beginner or it is your first C++ encounter.

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Views #: 499

Questions #: 18

Time: 15 minutes

Pass Score: 80.0%

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Read through this program and answer the following questions

1  //**************************************************************
2  // Given the length and width of a rectangle, this C++ program
3  // computes and outputs the perimeter and area of the rectangle.
4  //**************************************************************
5 
6  #include <iostream> 
7  using namespace std; 
8
9  int main()
10 {
11   double length; 
12   double width; 
13   double area; 
14   double perimeter;
15  
16   cout << "Program to compute and output the perimeter and " << "area of a rectangle." << endl;
17
19   length = 6.0;
20   width = 4.0;
21   perimeter = 2 * (length + width); 
22   area = length * width;
23   cout << "Length = " << length << endl; 
24   cout << "Width = " << width << endl;
25   cout << "Perimeter = " << perimeter << endl; 
26   cout << "Area = " << area << endl;
27   return 0;
28 }

In general, this progrm

1 pts

volume_mute

consumes inputs and produce outputs

does not consume inputs and produce outputs

None of the above

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Explanation

Sample Run: (When you compile and execute this program, the following five lines are displayed on the screen)

1 pts

volume_mute

Program to compute and output the perimeter and area of a rectangle.
Length = 6
Width = 4
Perimeter = 20
Area = 24

True

False

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Explanation

The output of the program is generated by executing the following statements

1 pts

volume_mute

cout << "Program to compute and output the perimeter and " <<  "area of a rectangle." << endl;
cout << "Length = " << length << endl;
cout << "Width = " << width << endl;
cout << "Perimeter = " << perimeter << endl;
cout << "Area = " << area << endl;

True

False

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Correct Answer

Explanation

Explain how this happens

1 pts

cout << "Program to compute and output the perimeter and " <<  "area of a rectangle."  << endl;

This is an example of a C++ (1) statement. It causes the computer to evaluate the (2) after the pair of symbols << and display the (3) on the screen

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output

result

expression

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Explanation

Arithmetic expression or a string?

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volume_mute

length + width

is an example of

An arithmetic expression

A string

A logical statement

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Explanation

"Program to compute and output the perimeter and " is an example of a string

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volume_mute

True

False

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Explanation

endl

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adds a dot to end of line

moves insertion point to the next line

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Explanation

cout << "Length = " << length << endl;

1 pts

What does the second length evaluate to?

(write a whole number without decimal points)

Missing

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Explanation

There is no way to output length value as 6.0?

1 pts

volume_mute

True

False

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Explanation

return 0;

1 pts

volume_mute

returns zero to the program itself which continues running

True

False

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Explanation

Main function

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volume_mute

A C++ program can execute without a main function

True

False

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Explanation

Anything comes after // is not executable

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True

False

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Explanation

#include <iostream>

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volume_mute

#include <iostream>

allows us to use the (predefined object) cout to generate output and the (manipulator) endl.

True

False

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Explanation

using namespace std;

1 pts

volume_mute

using namespace std;

This statement is useless. You can remove it and the program still compiles.

True

False

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Correct Answer

Explanation

int main()

1 pts

int main()

This is the (1) of the function main. The next line consists of a (2). This marks the beginning of the (body) of the function main. The (3) (at the last line of the program) matches this (4) and marks the end of the body of the function main.

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heading

right brace

left brace

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Explanation

Stream insertion operator

1 pts

volume_mute

cout

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Explanation

Various parts of a C++ program

1 pts

Match certain program sections

(1) lines from 1 to 4
(2) lines from 11 to 14
(3) lines from 19 to 22
(4) lines from 23 to 26

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Assignment statements

Variable declarations

Comments

Output statements

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Explanation

So length, width, area, and perimeter are all __________

1 pts

Missing

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Explanation

Year 10

In general, this progrm

Correct Answer

Explanation

Sample Run: (When you compile and execute this program, the following five lines are displayed on the screen)

Correct Answer

Explanation

The output of the program is generated by executing the following statements

Correct Answer

Explanation

Explain how this happens

Correct Answer

Explanation

Arithmetic expression or a string?

Correct Answer

Explanation

"Program to compute and output the perimeter and " is an example of a string

Correct Answer

Explanation

endl

Correct Answer

Explanation

cout << "Length = " << length << endl;

Correct Answer

Explanation

There is no way to output length value as 6.0?

Correct Answer

Explanation

return 0;

Correct Answer

Explanation

Main function

Correct Answer

Explanation

Anything comes after // is not executable

Correct Answer

Explanation

#include <iostream>

Correct Answer

Explanation

using namespace std;

Correct Answer

Explanation

int main()

Correct Answer

Explanation

Stream insertion operator

Correct Answer

Explanation

Various parts of a C++ program

Correct Answer

Explanation

So length, width, area, and perimeter are all __________

Correct Answer

Explanation

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