http:^^www.cs.bu.edu^courses^cs113^f96^solutions^nickesk.hw1

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Date: Tue, 14 Jan 1997 20:21:04 GMT
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Content-type: text/plain
Last-modified: Tue, 24 Sep 1996 00:36:23 GMT
Content-length: 10563

SOURCE FILES  (Execution tests follow)
====== =====


/*           File:  hw1-temp.c
 *           =====  ==========
 *         Author:  Nick Eskelinen
 *          Class:  CAS CS113
 *     Assignment:  AS 1, Prob 1 (based on ROBERTS 2-7, p50)
 *       Due Date:  13 September 1996
 *  Last Modified:  11 September 1996
 *  --------------------------------------------------------------------------
 *  
 *  USAGE:  hw1-temp (no commandline arguments)
 *  ======
 *
 *  OVERVIEW:
 *  =========
 *  This simple program accepts as input an integer value in degrees
 *  Fahrenheit and returns its Celsius equivalent to standard output.
 *  
 *  Algorithm Notes:
 *  ================
 *  Uses the simple algorithm (Fahrenheit-32)*5/9
 *
 *  Known Bugs:  none
 *  =========== 
 *
 *  Enhancements:  none
 *  =============
 *
 *  Error Handling:
 *  ===============
 *  1.  User enters a non-integer number.
 *      Error message:  Text displayed indicating why input is not acceptable.
 *      Error action:   User is given another chance to input.
 *
 *  Other Comments:
 *  ===============
 *  Because output is in integer form, decimal portion of output is truncated.
 *  Hence, an actual value of 1.7 would return an output of 1.  This is not
 *  preferable, however, and could be remedied with a round() function or
 *  similar.
 *  
 */

#include <stdio.h>
#include "genlib.h"
#include "simpio.h"

int main()
{
  int degCelsius, degFrnht;  /*  Assume input/output is integer  */

  printf("\nThis program converts Fahrenheit to Celsius.\n");
  printf("Enter a temperature in degrees Fahrenheit: ");
  degFrnht=GetInteger();
  degCelsius=(degFrnht-32)*5/9;  /*  Compiler automatically changes decimal
                                  *  to integer  */
  printf("%d degrees F = %d degrees C\n\n", degFrnht, degCelsius);
  return(0);
}


/* ---------------------- END OF FILE: hw1-temp.c ------------------- */


/*
 *          File:  hw1-weight.c
 *          =====  ============
 *        Author:  Nick Eskelinen
 *         Class:  CAS CS113
 *    Assignment:  Assignment 1, Problem 2 (ROBERTS Ch2, p57 #9)  
 *      Due Date:  13 September 1996
 * Last modified:  12 September 1996
 * -----------------------------------------------------
 *
 * USAGE:  hw1-weight (no command-line arguments)
 * ======
 *
 * OVERVIEW:
 * =========
 * This program takes a weight in kilograms and converts it into its
 * equivalent in pounds and ounces.
 *
 * Algorithm Notes:  
 * ================
 * The precise decimal value in pounds is first computed.  The non-
 * decimal portion is used as the "lb" value, while the decimal portion
 * is multiplied by 16 to obtain the "oz" value.
 *
 * Known Bugs:  none
 * ===========
 *
 * Enhancements:  none
 * =============
 *
 * Error Handling: 
 * ===============
 * 1.  User enters a non-numerical value.
 *     Error message:  Text displayed indicating why input is unacceptable.
 *      Error action:  User is given another chance to enter input.
 * 
 * Other Comments:
 * ===============
 * The precision of the "oz" output is set to one decimal place, but can be
 * changed to be more or less precise.
 */

#include <stdio.h>
#include "simpio.h"
#include "genlib.h"

int main()
{
  double kilos, totalPounds, ounces;  /* Input, output, & computation */
  int lbs;                            /* variables.                   */

  printf("\nThis program converts kilograms to pounds & ounces.\n");
  printf("Enter a weight in kilograms:  ");
  kilos=GetReal();

  totalPounds=kilos*2.2;         /* Precise value in pounds */
  lbs=(int) totalPounds;         /* Value output for "lb"   */
  ounces=(totalPounds-lbs)*16.0; /* Value output for "oz"   */

  printf("\n%g kg = %d lbs %.1f oz\n\n", kilos, lbs, ounces);
  return(0);
} /* end main */

/* -------------> END OF FILE: hw1-weight.c <----------------- */









/*
 *          File:  hw1-sum.c
 *          =====  =========
 *        Author:  Nick Eskelinen
 *         Class:  CAS CS113
 *    Assignment:  #1, Problem 3 (ROBERTS ch3-ex6, p94)
 *      Due Date:  13 September 1996
 * Last modified:  12 September 1996
 * -----------------------------------------------------
 *
 * USAGE:  hw1-sum (no command-line arguments)
 * ======
 *
 * OVERVIEW:
 * =========
 * This program takes as input an integer and returns the sum of all positive
 * integers less than or equal to the input.
 *
 * Algorithm Notes:  
 * ================
 * A for loop was utilized to compute the sum of 1+2+3+...+n, however, Gauss'
 * theorem sum = n*(n+1)/2 would also work.
 *
 * Known Bugs:  
 * ===========
 * Though not a bug in programming, when a user enters a value less than 1, a
 * sum of zero is returned.  Because it was not specifically mentioned
 * otherwise, the user is allowed to enter any integer, positive or negative.
 *
 * Enhancements:  none
 * =============
 *
 * Error Handling: 
 * ===============
 * 1. User enters a non-integer value.
 *     Program message:  Text displays why input is unacceptable.
 *      Program action:  User is given another chance to input.
 * 
 * Other Comments:
 * ===============
 * A routine could be added to ensure that the user does not enter a value
 * less than one.
 *
 */

#include <stdio.h>
#include "genlib.h"
#include "simpio.h"

int main()
{
  int posInt, maxNum, sum;

  printf("\nThis program prints the sum of all positive integers less than");
  printf("\nor equal to a given integer.\n");
  printf("Enter an integer:  ");
  maxNum=GetInteger();

  sum=0;
  for (posInt = 1; posInt <= maxNum; posInt++) {
    sum += posInt;
  } /* end for loop */

  printf("\nThe sum of all integers from 1 to %d is %d\n", maxNum, sum);
  return(0);
} /* end main */

/* ----------------> END OF FILE: hw1-sum.c <---------------- */


/*
 *          File:  hw1-stats.c
 *          =====  ===========
 *        Author:  Nick Eskelinen
 *         Class:  CAS CS113
 *    Assignment:  #1, Problem 4 (ROBERTS ch3-ex9&14, pp95-6)
 *      Due Date:  13 September 1996
 * Last modified:  12 September 1996
 * -----------------------------------------------------
 *
 * USAGE:  hw1-stats (no command-line arguments)
 * ======
 *
 * OVERVIEW:
 * =========
 * This program accepts as input a list of integers.  It then outputs the
 * number of items in the list, the average of the items, and the largest
 * number in the list.
 *
 * Algorithm Notes:  
 * ================
 * Standard "while" loop is used to add up the items in the list until user
 * enters the sentinel value of -1 (or any negative value).
 *
 * Known Bugs:  none
 * ===========
 *
 * Enhancements:  
 * =============
 * Program halts if user starts list with a negative number and returns an
 * exit code of 1.
 *
 * Error Handling: 
 * ===============
 * 1.  (See above)
 * 2.  User enters non-integer value for input
 *     Error message:  Text displayed telling why input is unacceptable.
 *      Error action:  User is given another chance to input data.
 * 
 * Other Comments: none
 * ===============
 */

#include <stdio.h>
#include "genlib.h"
#include "simpio.h"

int main()
{
  int numItems, item, sum, bigItem;
  double average;

  printf("\nThis program takes a list and finds its average & greatest #.");
  printf("\nEnter -1 to signal the end of the list:\n");

  numItems=0;      /* Variable initialization */
  sum=0;
  bigItem=0;

  while (TRUE) {
    printf("?: ");
    item=GetInteger();
    if (item<0) break;
    numItems++;
    sum += item;
    if (item>bigItem) bigItem=item;    /* Try to find largest number */
  } /* end while */
  if (numItems==0) {                   /* Avoid division by zero     */
    printf("\nEXITING PROGRAM...\n");
    return(1);
  } /* end if */
  average=(double) sum/numItems;

  printf(" Number of Items: %d", numItems);
  printf("\nAverage of Items: %g", average);
  printf("\n  Largest number: %d\n\n", bigItem);
  return(0);
} /* end main */

/* ---------------> END OF FILE: hw1-stats.c <------------------ */



EXECUTION TESTS
========= =====

hw1-temp < /home/course/cs113/GradesF96/HW1/temp.in1 


This program converts Fahrenheit to Celsius.
Enter a temperature in degrees Fahrenheit: 66 degrees F = 18 degrees C

============================================================
hw1-temp < /home/course/cs113/GradesF96/HW1/temp.in2 


This program converts Fahrenheit to Celsius.
Enter a temperature in degrees Fahrenheit: -45 degrees F = -42 degrees C

============================================================
hw1-weight < /home/course/cs113/GradesF96/HW1/weight.in1 


This program converts kilograms to pounds & ounces.
Enter a weight in kilograms:  
20 kg = 44 lbs 0.0 oz

============================================================
hw1-weight < /home/course/cs113/GradesF96/HW1/weight.in2 


This program converts kilograms to pounds & ounces.
Enter a weight in kilograms:  
167.25 kg = 367 lbs 15.2 oz

============================================================
hw1-sum < /home/course/cs113/GradesF96/HW1/sum.in1 


This program prints the sum of all positive integers less than
or equal to a given integer.
Enter an integer:  
The sum of all integers from 1 to 9 is 45
============================================================
hw1-sum < /home/course/cs113/GradesF96/HW1/sum.in2 


This program prints the sum of all positive integers less than
or equal to a given integer.
Enter an integer:  
The sum of all integers from 1 to 5100 is 13007550
============================================================
hw1-stats < /home/course/cs113/GradesF96/HW1/stats.in1 


This program takes a list and finds its average & greatest #.
Enter -1 to signal the end of the list:
?: ?: ?: ?: ?: ?: ?: ?: ?:  Number of Items: 8
Average of Items: 6.5
  Largest number: 12

============================================================
hw1-stats < /home/course/cs113/GradesF96/HW1/stats.in2 


This program takes a list and finds its average & greatest #.
Enter -1 to signal the end of the list:
?: 
EXITING PROGRAM...
============================================================

Data files:
==========:
==> /home/course/cs113/GradesF96/HW1/stats.in1 <==
7
3
8
1
9
12
4
8
-1


==> /home/course/cs113/GradesF96/HW1/stats.in2 <==
-1


==> /home/course/cs113/GradesF96/HW1/sum.in1 <==
9

==> /home/course/cs113/GradesF96/HW1/sum.in2 <==
5100

==> /home/course/cs113/GradesF96/HW1/temp.in1 <==
66

==> /home/course/cs113/GradesF96/HW1/temp.in2 <==
-45

==> /home/course/cs113/GradesF96/HW1/weight.in1 <==
20

==> /home/course/cs113/GradesF96/HW1/weight.in2 <==
167.25

============================================================