Copy a file and reverse case of letters with error checking. : File Utility « File « C++






  1. C++
  2. File
  3. File Utility

Copy a file and reverse case of letters with error checking.

 

#include <iostream>
#include <fstream>
#include <cctype>
using namespace std;

int main(int argc, char *argv[])
{
  char ch;

  if(argc!=3) {
    cout << "Usage: COPYREV <source> <target>\n";
    return 1;
  }

  ifstream in(argv[1]);

  if(!in) {
    cout << "Cannot open input file.\n";
    return 1;
  }

  ofstream out(argv[2]);

  if(!out) {
    cout << "Cannot open output file";
    return 1;
  }

  while(!in.eof()) {
    ch = in.get();
    if(!in.good() && !in.eof()) 
      return 1;
    if(!in.eof()) {
      if(islower(ch)) 
         ch = toupper(ch);
      else 
         ch = tolower(ch);
      out.put(ch);
      if(!out.good()) 
         return 1;
    }
  };

  in.close();
  out.close();
  if(!in.good() && !out.good()) 
     return 1;

  return 0;
}








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