Question

Engineering problem solving with C++ by Delores Maria Etter Jeanine A. Ingber

Page 247

Question 15

Write a program that reads a file containing an integer and floating-point values separated by commas, which may or may not be followed by additional whitespace. Generate a new file that contains the integers and floating-point values separated only by spaces; remove all whitespace characters between the values, and insert a single space between the values. Do not change the number of values per line in the file.

Answer 1

#include <iostream>
#include <fstream>
#include <string>
#include <algorithm> 
using namespace std; 
// removing space from the string
string remSpaces(string str) 
{ 
// remove all spaces
        str.erase(remove(str.begin(), str.end(), ' '), str.end()); 
        // return string
        return str; 
} 

int main () {
        // declaring variables 
  string line,str;
        //  declaring myoutfile object
  ofstream myOutfile;
  
  myOutfile.open ("output.txt");
  ifstream myfile ("input.txt");
  if (myfile.is_open())
  {
        // read line by line from the file
    while ( getline (myfile,line) )
    {
        // calling removespaces function assaigning into string
        
        str = remSpaces(line);
        // replacing comma with spacces
        replace(str.begin(), str.end(), ',', ' ');
        // writing into file with new line character
        myOutfile <<str<<"\n" ;
    }
    // closing both files
    myfile.close();
    myOutfile.close();
  }
// if file is not found will give 
  else cout << "file not found"; 

  return 0;
}