Input from Text file, Edit input, Ouput to new file

Hello! My professor gave an assignment where I needed to use data from an existing text file, edit it, and output it to a new file. I'm a bit new to programming so I'm unsure how to go about this. I've looked at a few articles and videos, but they weren't specific enough. If possible could I get some tips or even an example. Thank you!

We don't do homeworks here but we sure help you with specific questions you have.
Below is a sample code format you probably will need.

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#include <fstream>   // include this library

ifstream inputFile;     // declare input - output files
ofstream outputFile;

inputFile.open("filename.txt");    // open files
outputFile.open("filename.txt");

string data;
inputFile >> data;   // get data from file
data = whatEverYouwant; // edit data

outputFile << data << endl;    // output data to fil 


http://www.cplusplus.com/doc/tutorial/files/
Thank you! Where would I go for help with homework on this site?
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