Chapter 2, Problem 1P

A metric ton is 35,273.92 ounces. Write a program that will read the weight of a package of breakfast cereal in ounces and output the weight in metric tons as well as the number of boxes needed to yield 1 metric ton of cereal. Your program should allow the user to repeat this calculation as often as the user wishes.

Program Plan Intro

Weight of breakfast package

Program Plan:

• Include required header files.
• Initializes “const” variable “OUNCES_PER_METRICTON” to “35273.92”.
• Define main function,
  • Declare three variables in “double” datatype.
  • Declare a “char” variable for user option.
  • Then performs “do-while” loop.
    • Prompt statement for read the weight of packages in ounces.
    • Read the weight of packages from user.
    • Compute the weight in metric tons using “ounces/OUNCES_PER_METRICTON” and then store it in a variable “weightMetricTon”.
    • Compute the number of boxes required to produce “1” metric ton using “OUNCES_PER_METRICTON/ounces” and then store it in a variable “no_of_boxes”.
    • Display the weight in metric tons and number of boxes.
    • Prompt statement for read the user option to continue the calculation.
    • Read the user option.
  • Check the user option using “while” loop. If the user entered option is equal to “y” or “Y” then continue the above process.
    • Otherwise, the program terminated.

Program Description Answer

The below program is used to compute the weight of package of breakfast cereal in metric tons and number of boxes from the given weight of package in ounces

Explanation of Solution

Program:

//Header file

#include <iostream>

//For standard input and output

using namespace std;

/* Initializes the const variable "OUNCES_PER_METRICTON" to "35273.92" */

const double OUNCES_PER_METRICTON = 35273.92;

//Define main function

int main()

{

      //Declare variables in type of "double"

      double ounces, weightMetricTon, no_of_boxes;

      //Declare variable in type of "char"

      char option;

      //Check the condition using "do-while" loop

      do

      {

     /* Prompt statement for read the weight of package in ounces */

     cout << "Enter the weight of package of breakfast cereal in ounces: ";

            //Read the weight in ounces from user

            cin>>ounces;

            //Compute the given weight in metric ton

            weightMetricTon = ounces/OUNCES_PER_METRICTON;

     /* Compute the number of boxes required to produce "1" metric ton */

            no_of_boxes = OUNCES_PER_METRICTON/ounces;

            //Display the weight in metric tons

     cout << "Weight of packets in metric tons: " << weightMetricTon << endl;

            //Display the number of boxes

     cout << "Number of boxes needed to yield 1 metric ton of cereal: " << no_of_boxes << endl;

            //Prompt statement for asking the user choice

     cout << "Enter 'y' or 'Y' to continue (OR) Enter any character to terminate: ";

            //Read option from user

            cin >> option;

      }

  /* If the user entered option is "y" or "Y", then continue the above process. Otherwise program terminated */

      while (option == 'y' || option == 'Y');

      return 0;

}

Sample Output

Output:

Enter the weight of package of breakfast cereal in ounces:  4000

Weight of packets in metric tons: 0.113398

Number of boxes needed to yield 1 metric ton of cereal: 8.81848

Enter 'y' or 'Y' to continue (OR) Enter any character to terminate:  y

Enter the weight of package of breakfast cereal in ounces:  4820

Weight of packets in metric tons: 0.136645

Number of boxes needed to yield 1 metric ton of cereal: 7.31824

Enter 'y' or 'Y' to continue (OR) Enter any character to terminate:  n