Homework 9
Due November 12, 2002
Solutions

1a) True
1b) True
1c) False (the user can enter the numbers on two lines - in other words,
           the user can type <enter> after each number)
1d) False
1e) True

2a) x: 5    y: 28   ch: '3'
2b) x: 28   y: 36   ch: '5'
2c) x: 5    y: 8    ch: '2'
2d) x: 5    y: 28   ch: ' ' 

6)
#include <iostream>
#include <fstream>
using namespace std;
int main()
{
  int num1, num2;
  ifstream infile;
  ofstream outfile;

  infile.open("input.dat");
  outfile.open("output.dat");
  infile>>num1>>num2;
  outfile<<"Sum = "<<num1+num2<<endl;

  infile.close();
  outfile.close();
  return 0;
}

8a) inputFile.dat has not been changed - it contains the original contents
    of inputFile.dat
8b) The file outFile.dat contains the output of the program (the results of
    the calculations that were written to the file)
8c) The old contents of outFile.dat are erased - the file just contains the
    output of the program.  If, however, the the outFile.dat was opened
    with ios::app, then the output of the program will be appended to (stored
    at the end of) the original 100 numbers contained in outFile.dat
8d) The file outFile.dat is created - then the output of the program is
    written to the file.