File I/O Exercise:

• Given the following program readline.cpp and the data file input.dat:

  // Program readline.cpp demonstrates how to read a line of text from a file
  
  #include <iostream>
  #include <fstream>
  #include <string>
  using namespace std;
  
  int main()
  {
  
      string str1, str2, str3, str4;      // declares 4 variables
      ifstream inData;                    // declares input stream
      ofstream outData;                   // declares output stream
  
      inData.open("input.dat");
      // binds program variable inData to the input file "input.dat"
  
      outData.open("output.dat");
       // binds program variable outData to the output file "output.dat"
  
      // input 4 lines
      getline(inData,str1);
      getline(inData,str2);
      getline(inData,str3);
      getline(inData,str4);
  
      // output 4 lines
      outData  << str4  << endl;
      outData  << str3  << endl;
      outData  << str2  << endl;
      outData  << str1  << endl;  // outputs 4 lines
  
      inData.close();
      outData.close();
  
      return 0;
  }
  
  

• The input data file input.dat.

  Allan Smith
  John Cooper
  Zhang Hua
  Yao Ming
  

  You are required to deliver the following:

  • Edit/create the input data file input.dat and the program file readline.cpp.
  • Compile and run the program readline.cpp.
  • Check the content of the output data file by cat output.dat in hercules or notepad for Visual Studio users.
  • Add your full name and your CS110 class instructor's name in the input data file input.dat a line for each.
  • Modify the program readline.cpp to work with your new input data file.
  • Compile and run this C++ program.
  • Run the program for your lab instructor and show the result in output.dat.

Copyright: Department of Computer Science, University of Regina.