//File:        justify.cpp
//Date:        3/2019
//Programmer:  Dr. J. Maletic
//Description: Text justifcation program.
#include <string.h>
#include <iostream>
#include <fstream>

/////////////////////////////////////////////////////
1 void open_input_file(ifstream &in)
2 {  char filename[80];
3    cout << "Enter Input File Name: "; cin >> filename; in.open(filename);
4 }

/////////////////////////////////////////////////////
5 void open_output_file(ofstream &out)
6 {  char filename[80];
7    cout << "Enter Ouput File Name: "; cin >> filename;  out.open(filename);
8 }

/////////////////////////////////////////////////////
//PRE:  Assigned(input) && Assigned(output) && 
//      Assigned(line_size) 
//POST: Contents of input is written to output and
//      justified to line_size.
9 void justify_file(ifstream &input, ofstream &output, int line_size) {
10   string   word,
11            buffer;
12   string   leading_blanks("     ");
           
13   while (input >> word) {
14     if ((buffer.length() +
15            word.length() + 1) <= line_size)
16       if (buffer == "")
17         buffer = word;
18       else
19         buffer = buffer + " " + word;
20     else {
21      buffer = buffer.justify(line_size);
22      output << leading_blanks << buffer << endl;
23      buffer = word;
24    }
25  }
26  output << leading_blanks << buffer << endl;
27 }

/////////////////////////////////////////////////////
28 int main () {
29   int      line_size;
30   ifstream input;
31   ofstream output;
  
32   open_input_file(input);
33   open_output_file(output);
34   cout << "Enter line size: ";
35   cin >> line_size;
36   justify_file(input, output, line_size);
37  return 0;
38 }