CPTR 124 Fundamentals of Programming

The purpose of this lab is to use if/else statements to allow programs to optionally execute various statements depending on user input.

  1. Forming a Team

    You are encouraged to choose a partner from this class as a teammate. You two will work together on this assignment.

    You are not required to work with someone else; you may work alone if you prefer.

  2. Familiarize yourself with the assignment

    Read over the complete lab before you begin creating your project and C++ source file.

  3. Housekeeping

    You will need to create a separate Visual Studio project for this program.

  4. What to do

    Write a program that accepts a single integer from the user. In response, the program should print a single line consisting of the English text representation of that number.

    Some specifics:

    • The program should be able to handle any integer the user provides. For integers in range –100...100, the program should print the English word that represents the number.

    • If the user enters a value less than –100, the program should print "too small." If the user enters a value greater than 100, the program should print "too big."

    • Your program can print 203 possible messages, but you may not use 203 if statements as shown in the following code fragment: 

      //  Code like this is NOT acceptable!
          .
          .
          .
if (n == 34)
    cout << "thirty-four" << endl;
else if (n == 35)
    cout << "thirty-five" << endl;
else if (n == 36) {
    cout << "thirty-six" << endl;
          .
          .
          .

      You must use if statements for your conditional checks, but you are limited to 50 or fewer if statements within your code. This means you need to look for common properties that can reduce the number of required if statements. Any value between 71 and 79 would have the prefix "seventy-", for example. A subsequent if statement then would determine the ones digit to follow (via the modulus of 10) and print it separately.

    • Treat the values 10-19 as special cases since their names are irregular. For example, 23 is "twenty-three," but 13 is not "ten-three."

    • There many ways to solve the problem. One approach uses the following logic flow:

      Number to text flowchart

    Do not include capital letters in your text result, and do not include any extraneous spaces. Example acceptable results are "negative thirty-five" for -35, and "four" for 4. Here is the definitive list of proper number spellings that we will use for this lab: 

    -101 : too small
-100 : negative one hundred
 -99 : negative ninety-nine
 -98 : negative ninety-eight
 -97 : negative ninety-seven
 -96 : negative ninety-six
 -95 : negative ninety-five
 -94 : negative ninety-four
 -93 : negative ninety-three
 -92 : negative ninety-two
 -91 : negative ninety-one
 -90 : negative ninety
 -89 : negative eighty-nine
 -88 : negative eighty-eight
 -87 : negative eighty-seven
 -86 : negative eighty-six
 -85 : negative eighty-five
 -84 : negative eighty-four
 -83 : negative eighty-three
 -82 : negative eighty-two
 -81 : negative eighty-one
 -80 : negative eighty
 -79 : negative seventy-nine
 -78 : negative seventy-eight
 -77 : negative seventy-seven
 -76 : negative seventy-six
 -75 : negative seventy-five
 -74 : negative seventy-four
 -73 : negative seventy-three
 -72 : negative seventy-two
 -71 : negative seventy-one
 -70 : negative seventy
 -69 : negative sixty-nine
 -68 : negative sixty-eight
 -67 : negative sixty-seven
 -66 : negative sixty-six
 -65 : negative sixty-five
 -64 : negative sixty-four
 -63 : negative sixty-three
 -62 : negative sixty-two
 -61 : negative sixty-one
 -60 : negative sixty
 -59 : negative fifty-nine
 -58 : negative fifty-eight
 -57 : negative fifty-seven
 -56 : negative fifty-six
 -55 : negative fifty-five
 -54 : negative fifty-four
 -53 : negative fifty-three
 -52 : negative fifty-two
 -51 : negative fifty-one
 -50 : negative fifty
 -49 : negative forty-nine
 -48 : negative forty-eight
 -47 : negative forty-seven
 -46 : negative forty-six
 -45 : negative forty-five
 -44 : negative forty-four
 -43 : negative forty-three
 -42 : negative forty-two
 -41 : negative forty-one
 -40 : negative forty
 -39 : negative thirty-nine
 -38 : negative thirty-eight
 -37 : negative thirty-seven
 -36 : negative thirty-six
 -35 : negative thirty-five
 -34 : negative thirty-four
 -33 : negative thirty-three
 -32 : negative thirty-two
 -31 : negative thirty-one
 -30 : negative thirty
 -29 : negative twenty-nine
 -28 : negative twenty-eight
 -27 : negative twenty-seven
 -26 : negative twenty-six
 -25 : negative twenty-five
 -24 : negative twenty-four
 -23 : negative twenty-three
 -22 : negative twenty-two
 -21 : negative twenty-one
 -20 : negative twenty
 -19 : negative nineteen
 -18 : negative eighteen
 -17 : negative seventeen
 -16 : negative sixteen
 -15 : negative fifteen
 -14 : negative fourteen
 -13 : negative thirteen
 -12 : negative twelve
 -11 : negative eleven
 -10 : negative ten
  -9 : negative nine
  -8 : negative eight
  -7 : negative seven
  -6 : negative six
  -5 : negative five
  -4 : negative four
  -3 : negative three
  -2 : negative two
  -1 : negative one
   0 : zero
   1 : one
   2 : two
   3 : three
   4 : four
   5 : five
   6 : six
   7 : seven
   8 : eight
   9 : nine
  10 : ten
  11 : eleven
  12 : twelve
  13 : thirteen
  14 : fourteen
  15 : fifteen
  16 : sixteen
  17 : seventeen
  18 : eighteen
  19 : nineteen
  20 : twenty
  21 : twenty-one
  22 : twenty-two
  23 : twenty-three
  24 : twenty-four
  25 : twenty-five
  26 : twenty-six
  27 : twenty-seven
  28 : twenty-eight
  29 : twenty-nine
  30 : thirty
  31 : thirty-one
  32 : thirty-two
  33 : thirty-three
  34 : thirty-four
  35 : thirty-five
  36 : thirty-six
  37 : thirty-seven
  38 : thirty-eight
  39 : thirty-nine
  40 : forty
  41 : forty-one
  42 : forty-two
  43 : forty-three
  44 : forty-four
  45 : forty-five
  46 : forty-six
  47 : forty-seven
  48 : forty-eight
  49 : forty-nine
  50 : fifty
  51 : fifty-one
  52 : fifty-two
  53 : fifty-three
  54 : fifty-four
  55 : fifty-five
  56 : fifty-six
  57 : fifty-seven
  58 : fifty-eight
  59 : fifty-nine
  60 : sixty
  61 : sixty-one
  62 : sixty-two
  63 : sixty-three
  64 : sixty-four
  65 : sixty-five
  66 : sixty-six
  67 : sixty-seven
  68 : sixty-eight
  69 : sixty-nine
  70 : seventy
  71 : seventy-one
  72 : seventy-two
  73 : seventy-three
  74 : seventy-four
  75 : seventy-five
  76 : seventy-six
  77 : seventy-seven
  78 : seventy-eight
  79 : seventy-nine
  80 : eighty
  81 : eighty-one
  82 : eighty-two
  83 : eighty-three
  84 : eighty-four
  85 : eighty-five
  86 : eighty-six
  87 : eighty-seven
  88 : eighty-eight
  89 : eighty-nine
  90 : ninety
  91 : ninety-one
  92 : ninety-two
  93 : ninety-three
  94 : ninety-four
  95 : ninety-five
  96 : ninety-six
  97 : ninety-seven
  98 : ninety-eight
  99 : ninety-nine
 100 : one hundred
 101 : too big

    Notice that no capital letters appear anywhere. Be sure the required spaces and dashes are in their proper places.

  5. Check out

    I will review your lab with you before you leave. Be prepared to answer questions about any parts of your programs. After you have been checked out, please submit your C++ source code (the .cpp files) to eclass.e.southern.edu.

  6. Log out

    Don't forget to log out on your lab workstation and take your USB drive before you leave the lab.