Need help with text reversing progam..

[ThunderCow]

i'm trying to write a program that will take the contents of one file and completely reverse it and put it into a new file... what i have currently takes each word and reverses it then puts it into a file... for example:

input: the dog was big
current program: eht god saw gib
what i want: gib saw god eht

i had tried to use getline before but i could get it to work..

heres my code so far:

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

void main()
{
char filenameOld[30];
char filenameNew[30];
string text;
int i;
cout << "What file do you want to backwardsify?\n";
cin.getline(filenameOld, 30, '\n');

cout << "What do you want the new file to be called?\n";
cin.getline(filenameNew, 30, '\n');

ifstream a_file(filenameOld);
                           
ofstream b_file(filenameNew); 

	do
	{
		a_file>>text;
		for (i=text.length(); i>=0; i--)
		{
			b_file<<text[i];
		}
		b_file<<" ";

		cout<<".";
	}
	while (a_file.eof()!=1);

cout<<"DONE\n";

a_file.close();
b_file.close();    
 

}

any suggestions?

[zen]

If you want to reverse the whole file this will do it -

#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include <algorithm>

using namespace std;

int main()
{
    string filenameOld;
    string filenameNew;
    string text;
    vector <string> strs;
    
    cout << "What file do you want to backwardsify?\n";
    getline(cin,filenameOld, '\n');

    cout << "What do you want the new file to be called?\n";
    getline(cin,filenameNew,'\n');

    ifstream a_file(filenameOld.c_str());                     
    ofstream b_file(filenameNew.c_str()); 

    if(a_file.fail() || b_file.fail())
    {
        cout << "Unable to open files\n";
        return 1;
    }

    do
    {
        getline(a_file,text,'\n');
        reverse(text.begin(),text.end());
        strs.push_back(text);
        cout<<".";
    }
    while (a_file.eof()!=1);


    reverse(strs.begin(),strs.end());

    for (int j =0;j<strs.size();j++)
        b_file << strs[j] << endl;


    cout<<"DONE\n";

    return 0;
}
 

but if you only want to reverse each line then you won't need to store the strings in a vector and could just ouput each line after it has been reversed in the initial loop.

[ThunderCow]

that was very helpful, thanks!

[guest]

You could also try reading file one char at a time into a char array adding a single null char at the end, effectively making the entire file a single string. Then use strrev() function on the string and write it a single char at a time to the second file.