Updates a record in a text file.

edit.cpp

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

bool updateRecord(string currentRecord, string newRecord)
{
    ifstream inFile("Data.txt"); // File to read from
    ofstream outFile("Temp.txt", ios::trunc); // Temporary file
    
    if(!inFile || !outFile) {
        cout << "An error occured while opening the files." << endl;
        return false;
    }
    
    // Copy all the records to a temporary file while editing a record
    string currentLine;
    while (getline(inFile, currentLine)) {
        if (currentLine == currentRecord)
            currentLine = newRecord;
        
        currentLine += "\n";

        outFile << currentLine;
    }
    
    inFile.close();
    outFile.close();
    
    
    // Swap temp file to active file
    ifstream tempFile("Temp.txt");
    ofstream currentFile("Data.txt", ios::trunc);
    
    // Loop temp file line by line
    string currentLine;
    while (getline(tempFile, currentLine))
        // Copy contents of temp file to current file
        currentFile << currentLine << "\n";
    
    tempFile.close();
    currentFile.close();
    
    return true;
}