CSCI 131 Techniques of Programming--Spring 2014

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Solution to Project 1

//**************************************************************************
// proj1.cc
//    Author: Brenda Student
//    Date: February 10, 2014
//    Class: CSCI 131 project1, Professor Royden
//    Purpose: Computes the final position and velocity of a falling object
//             given the initial position and velocity
//    Input: (from standard input) Inputs the initial position, initial
//             velocity and elapsed time.
//    Output: (to myproj1.out file) Outputs the intial position, initial
//              velocity, elapsed time, final position and final velocity.
//***************************************************************************

#include <iostream>                    //required io libraries
#include <iomanip>
#include <fstream>
using namespace std;

int main(void) {
   const float GRAVITY = 32.0;            //gravitational acceleration
   float xInitial;                        //Initial position
   float vInitial;                        //Initial velocity
   float time;                            //elapsed time
   float xFinal;                          //Final position
   float vFinal;                          //Final velocity

   ofstream outFile;                      //output filestream

   //Enter input data
   cout << "Enter the initial position ==> ";
   cin >> xInitial;
   cout << xInitial << endl;

   cout << "Enter the initial velocity ==> ";
   cin >> vInitial;
   cout << vInitial << endl;

   cout << "Enter the time  ==> ";
   cin >> time;
   cout << time << endl;

   //Compute final position and velocity
   xFinal = xInitial - vInitial*time - 0.5*GRAVITY*time*time;
   vFinal = vInitial + GRAVITY * time; 

   //Send the results to a file
   outFile.open("myproj1.out");

   outFile.setf(ios::fixed, ios::floatfield);
   outFile.setf(ios::showpoint);
   outFile << endl << endl;
   outFile << "---------------------------------------------------" 
	   << endl << endl;

   outFile << setw(25) << "The initial position = "
	   << setw(10) << setprecision(2) << xInitial << " feet." << endl;
   outFile << setw(25) << "The initial velocity = " 
	   << setw(10) << setprecision(2) << vInitial << " feet/sec." << endl;

   outFile << setw(25) << "The elapsed time = " 
	   << setw(10) << setprecision(2) << time << " seconds." << endl;
   outFile << setw(25) << "The final position = "
	   << setw(10) << setprecision(2) << xFinal << " feet." << endl;
   outFile << setw(25) << "The final velocity = "
	   << setw(10) << setprecision(2) << vFinal << " feet/sec." << endl;
   outFile << endl;
   outFile << "---------------------------------------------------" 
	   << endl << endl;

   outFile.close( );

   return 0;
} //end main

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Constance Royden--croyden@mathcs.holycross.edu
CSCI 131: Techniques of Programming
Last Modified: February 10, 2014
Page Expires: September 13, 2014