CS140 -- Lab 6

• CS140 -- Data Structures
• Fall, 2007
• James S. Plank
• This file: http://www.cs.utk.edu/~plank/plank/classes/cs140/Labs/Lab6/index.html
• Hints

Executables and test input files are in the directory /home/plank/cs140/Labs/Lab6. As usual, if you have questions about how these programs should work, try these.

This Lab consists of two programs: mydc and histogram. In the first you should use a stack, and in the second you should use a queue.

mydc

MYDC(1)                    USER COMMANDS                    MYDC(1)

NAME
     mydc - desk calculator

SYNOPSIS
     mydc 

DESCRIPTION
     mydc is an arithmetic package.  It operates on integers.  The
     overall structure of mydc is a stacking (reverse Polish)
     calculator.  Input comes from standard input.

     The following input constructs are recognized:

  Commands
     number  Push a number onto the  stack.

     +  - /  *  % 
             The top two values on the stack  are:  added  (+),
             subtracted   (-),  multiplied  (*),  divided  (/),
             or remaindered (%).   The  two entries are popped off 
             the stack and the result is pushed in their place.  

     d       Duplicate the top value on the stack.

     p       Print the top value on the stack.  The  top  value
             remains unchanged.

     q       Exit the program.

     P       Pop the top value off the stack (don't print it).

     s       Swap the top two values on the stack.

     c       Clear the stack (i.e. pop off all values)

EXAMPLE

     INPUT: 5 6 + p                 OUTPUT: 11
     INPUT: 3 4 5 - * p 2 - p       OUTPUT: -3
                                            -5
     INPUT: c p                     OUTPUT: main stack: empty
     INPUT: +                       OUTPUT: not enough operands
     INPUT: + 1 2 + p               OUTPUT: not enough operands
                                            3

histogram

For example, suppose the data is composed of the numbers 3, 3, 4, 5, 5, 6, 7:

• If granularity is equal to one, then there are five bins: [3], [4], [5], [6] and [7].
• If granularity is equal to two, then there are three bins: [2-3], [4-5], and [6-7].
• If granularity is equal to three, then there are two bins: [3-5] and [6-8].
• If granularity is equal to eight, then there is one bin: [0-7].

Histogram reads the data, figures out the lowest and the highest bins, and then for each potential bin from the highest to the lowest, it prints out the identity of the bin, left-justified and padded to 15 characters, a space, and then an asterisk for each element that is in the bin.

So, the input file Simpex.txt contains the example data above:

3
3
4
5
5
6
Ignore text before the last word, which is the data: 7

Here are a few example calls of histogram:

UNIX> histogram 1 < Simpex.txt
[7]             *
[6]             *
[5]             **
[4]             *
[3]             **
UNIX> histogram 2 < Simpex.txt
[6-7]           **
[4-5]           ***
[2-3]           **
UNIX> histogram 3 < Simpex.txt
[6-8]           **
[3-5]           *****
UNIX> histogram 8 < Simpex.txt
[0-7]           *******
UNIX>

• Masters-Final.txt: The final round scores from the 2007 Masters golf tournament:

  UNIX> histogram 1 < Masters-Final.txt
  [83]            *
  [82]            *
  [81]            *
  [80]            **
  [79]            **
  [78]            *
  [77]            *******
  [76]            ******
  [75]            ******
  [74]            ******
  [73]            *******
  [72]            *******
  [71]            *******
  [70]            ***
  [69]            ***
  UNIX> 
  

• CS140-Grades.txt: Final grades for the five times that I have taught CS140 (only for students that didn't drop and that took the final exam). Note, even though the numbers are doubles, I read them in as integers. Note also that empty bins are still printed out.

  UNIX> histogram 5 < CS140-Grades.txt
  [95-99]         *************
  [90-94]         **********************************
  [85-89]         ******************************
  [80-84]         ****************************
  [75-79]         ************************
  [70-74]         ******************
  [65-69]         ************
  [60-64]         *************
  [55-59]         *****
  [50-54]         ********
  [45-49]         *
  [40-44]         *****
  [35-39]         **
  [30-34]         
  [25-29]         *
  [20-24]         **
  [15-19]         **
  UNIX> 
  

• Super-14-2007.txt: Scores of each team in the 2007 Super-14 Rugby tournament (a professional league with teams from South Africa, Australia and New Zealand).

  UNIX> histogram 5 < Super-14-2007.txt
  [90-94]         *
  [85-89]         
  [80-84]         
  [75-79]         
  [70-74]         
  [65-69]         
  [60-64]         *
  [55-59]         *
  [50-54]         *
  [45-49]         **
  [40-44]         ****
  [35-39]         *************
  [30-34]         ***********************
  [25-29]         ************************
  [20-24]         *******************************
  [15-19]         **************************
  [10-14]         ***************************
  [5-9]           ********************
  [0-4]           ********
  UNIX> 
  

• Bridge-Example.txt Scores from 34 hands of a duplicate bridge game in Maryville, with each hand played by roughly twelve different pairs:

  UNIX> histogram 100 < Bridge-Example.txt 
  [1400-1499]     *
  [1300-1399]     *******
  [1200-1299]     *
  [1100-1199]     ***
  [1000-1099]     ***
  [900-999]       
  [800-899]       **
  [700-799]       
  [600-699]       **************************
  [500-599]       ***********
  [400-499]       ****************************************
  [300-399]       ***
  [200-299]       **************
  [100-199]       ***********************************************************************
  [0-99]          ******************************
  [-100--1]       ****************************************************************
  [-200--101]     *************************************************************************
  [-300--201]     ********
  [-400--301]     ****
  [-500--401]     *******************
  [-600--501]     ********
  [-700--601]     ********************
  [-800--701]     ***
  [-900--801]     
  [-1000--901]    **
  [-1100--1001]   
  [-1200--1101]   
  [-1300--1201]   
  [-1400--1301]   
  [-1500--1401]   
  [-1600--1501]   ***
  UNIX>