Convert spaces to |s.

#include <iostream>#include <fstream>using namespace std;int main(int argc, char *argv[]){  if(argc!=3) {    cout << "Usage: CONVERT <input> <output>\n";    return 1;  }  ifstream fin(argv[1]); // open input file  ofstream fout(argv[2]);  // create output file  if(!fout) {    cout << "Cannot open output file.\n";    return 1;  }  if(!fin) {    cout << "Cannot open input file.\n";    return 1;  }  char ch;  fin.unsetf(ios::skipws);  // do not skip spaces  while(!fin.eof()) {    fin >> ch;    if(ch==' ') ch = '|';    if(!fin.eof()) fout << ch;  }  fin.close();  fout.close();  return 0;}