Question

Write a program to remove extra blanks from text files. Your program should replace any string of two or more blanks with one single blank. It should work as follows:

* Create a temporary file.
* Copy from the input file to the temporary file, but do not copy extra blanks. * Copy the contents of the temporary file back into the original file.
* Remove the temporary file.

Your temporary file must have a different name than any existing file, so that no files other than the input file are changed. Your program should ask the user for the name of the file to be edited, but should not request a name for the temporary file. Instead, generate the name within the program. You can generate the temporary file using any strategy that is clear and efficient. For example, you could start with a name like TempX and check if that name already exists. If it doesn't, you can use that name for the temporary file; if it does exist, append additional random letters to the filename until you find a name that isn't already used.

Language is in C++

Answer 1

Please find the code below.

#include <iostream>
#include <string>
#include <fstream>
#include <stdio.h>
#include <sstream>
#include <cmath>

using namespace std;
int main( )
{
   ifstream infile;
   string line;//for read line
   char fileName[20];
   cout<<"Enter file name : ";
   cin>>fileName;
   string tempFile ="temp";
   while(true){
       cout<<"Opening file "<<tempFile;
       infile.open (tempFile+".txt"); //name of file here. plz mention Complete path if file is not at root
       cout<<"File found. Creating new file"<<endl;
       if (infile.is_open())   {
           int randN = rand()%10;
           stringstream sstm;
           sstm << tempFile << randN;
           tempFile = sstm.str();
           infile.close();
       }else{
           break;
       }
   }
   infile.open (fileName); //name of file here. plz mention Complete path if file is not at root
   if (infile.is_open()) //if file opened
   {
       ofstream writer (tempFile+".txt"); //printing data to out file
       while( getline(infile, line,'\n') ) { //get row from text file
           stringstream ss(line); //stream to other variable
           while(ss>>line){ //row delimeter by space
               writer<<line<<" ";
           }
           writer<<endl;
       }
       infile.close(); //close file
       cout<<"File scan done........"<<endl;
   }
   else //if file not found show the below message
   {
       cout << "Sorry, we could not find the file.Please try again!!!!" << endl;
   }

   //copy content to orginal file
   infile.open (tempFile+".txt"); //name of file here. plz mention Complete path if file is not at root
   if (infile.is_open()) //if file opened
   {
       ofstream writer (fileName); //printing data to out file
       while( getline(infile, line,'\n') ) { //get row from text file
           writer<<line<<endl;
       }
       infile.close(); //close file
       cout<<"Copy done to input file";
   }
   else //if file not found show the below message
   {
       cout << "Sorry, we could not find the file.Please try again!!!!" << endl;
   }

   //removing file
   char fileName2[100];
   stringstream ss(tempFile+".txt");
   ss>>fileName2;
   remove(fileName2);

   return 0;
}

output:

where file content before:

once upon a time there were three little pig who lived alone with a big pig all are pig and pig
wat how where jmm
sdfj sdf ds sdf dsf sdf

after:

once upon a time there were three little pig who lived alone with a big pig all are pig and pig
wat how where jmm
sdfj sdf ds sdf dsf sdf