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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QUESTION OF

Views #: 327

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

consumes inputs and produce outputs

does not consume inputs and produce outputs

None of the above

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POINTS (1)

Correct Answer

Explanation

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

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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POINTS (1)

Correct Answer

Explanation

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

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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POINTS (1)

Correct Answer

Explanation

Explain how this happens

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

This is an example of a C++ (1) transparent 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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POINTS (1)

Correct Answer

Explanation

Arithmetic expression or a string?

length + width

is an example of

An arithmetic expression

A string

A logical statement

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POINTS (1)

Correct Answer

Explanation

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

True

False

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POINTS (1)

Correct Answer

Explanation

endl

adds a dot to end of line

moves insertion point to the next line

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POINTS (1)

Correct Answer

Explanation

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

What does the second length evaluate to?

(write a whole number without decimal points)

Missing

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POINTS (1)

Correct Answer

Explanation

There is no way to output length value as 6.0?

True

False

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POINTS (1)

Correct Answer

Explanation

return 0;

returns zero to the program itself which continues running

True

False

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POINTS (1)

Correct Answer

Explanation

Main function

A C++ program can execute without a main function

True

False

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POINTS (1)

Correct Answer

Explanation

Anything comes after // is not executable

True

False

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POINTS (1)

Correct Answer

Explanation

#include <iostream>

#include <iostream>

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

True

False

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POINTS (1)

Correct Answer

Explanation

using namespace std;

using namespace std;

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

True

False

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POINTS (1)

Correct Answer

Explanation

int main()

int main()

This is the (1) transparent 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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POINTS (1)

Correct Answer

Explanation

Stream insertion operator

cout

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POINTS (1)

Correct Answer

Explanation

Various parts of a C++ program

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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POINTS (1)

Correct Answer

Explanation

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

Missing

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POINTS (1)

Correct Answer

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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