Getting started

Refer to Lab 1 if you need a reminder about how to start Cygwin Terminal or Notepad++.

Start by downloading CS101_Lab09.zip, saving it in the directory H:\CS101.

Start a Cygwin Terminal and run the following commands:

cd h:
cd CS101
unzip CS101_Lab09.zip
cd CS101_Lab09

Using Notepad++, open the file

H:\CS101\CS101_Lab09\BarGraph.cpp

Design notes

When you create your design artifact for this lab, you should create two control flow sketches:

Each control flow sketch should be in pseudo code: see Lab 5 for a discussion of what pseudo code should look like.

Your task

Write a program that prompts the user to draw one or more bars of a bar graph.

To draw each bar, the program should prompt the user for a length, and then draw a bar with that many equals (“=”) characters.  After drawing each bar, the program should ask whether or not to continue, and read a single input character.  If the user enters a ‘Y’ or ‘y’ character, then the program should continue.  If the user enters any other character, the program should finish.

Example of running the program (user input in bold):

length? 20
====================
another? y
length? 65
=================================================================
another? y
length? 51
===================================================
another? n

Hints

You will need nested loops.  The outer loop will have the code to prompt for and draw a single bar.  The inner loop will draw each character in a single bar.

For each loop, you will need to choose between a while and a do/while loop.  The rule is that if the loop should be able to execute 0 times, it should be a while.  If it must be guaranteed to execute at least once, it should be a do/while.

You should start with a program that prompts for and draws a single bar.  That code will then become the body of the outer loop that draws however many bars the user requests.

You can use the following code to read a single character from the user and check whether it is “Y” or “y”:

char answer;
scanf(" %c", &answer);
if (answer == 'Y' || answer == 'y') {
    // user entered "Y" or "y"
} else {
    // user entered some other character
}

Note that in the call to scanf there is a space before the %c.

Submit

To submit your work, type the command

make submit

Enter your Marmoset username and password (which you should have received by email.) Note that your password will not be echoed to the screen.