I am trying to create a c++ file which reads pre-existing data files containing

Question

I am trying to create a c++ file which reads pre-existing data files containing celsius or fahrenheit values and converts those values to their opposite reading (celsius of fahrenheit) and places the converted values in a new file.

The point of this is to create and use functions which get this done.

I am a beginner to any type of coding.

I have a large number of errors and any help would be greatly appericiated.

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

void myMenu() //first function for the menu
{
   cout << "Option 1: Convert Celcius to Fahrenheit" << endl;
   cout << "Option 2: Convert Fahrenheit to Celcius" << endl;
   cout << "Option 3: Exit" << endl;
}

int myc2f() // second function converting the the file from celsius to fahrenheit
{
   string line; // define
   ifstream celcfile ("data_Celsius.txt"); // open and read the file
   while (!celcfile.eof()) // read and convert the file values
   {
       getline(celcfile, line);
       line = ((9 / 5)*line +32);
       ofstream mycelc("Oja_Fahrenheit_Output.txt"); // output the converted values to a new file
       cout << line << endl;
      
   }
   celcfile.close();
}

int myf2c()
{
   string line2; // define
   ifstream fahrfile("data_Fahrenheit.txt");
   while (!fahrfile.eof()) // to read and convert the file from fahr to cels
   {
       getline(fahrfile, line2); //possibly here
       line2 = ((line2 - 32)*(5/9));
       ofstream mycelc("Oja_Celcius_Output.txt"); // create new file with the outputted conversion of celcius to fahrenheit
       cout << line2 << endl;

   }
   fahrfile.close();
}

int main()
{
   cout << "----------------------------------------------" << endl;
   cout << "Solution for ASSIGNMENT #" << endl;
   cout << "----------------------------------------------" << endl << endl;

   int xin;
   myMenu();
   cin >> xin; // get the users input command
   system("CLS");

   while (xin != 3)
   {
       if (xin == 1)
       {
           cout << "Celcius to Fahrenheit Process is initiated" << endl;
           myc2f(); // initiate the conversion with the function
           cout << "Celcius to Fahrentheit Process is completed" << endl << endl;
           cout << "Option 2: Convert Fahrenheit to Celcius" << endl;
           cout << "Option 3: Exit" << endl;
           cin >> xin;
           system("CLS");
       }
       else if (xin == 2)
       {
           cout << "Fahrenheit to Celcius Process is initiated" << endl;
           myf2c(); // initiate the conversion with the function
           cout << "Fahrenheit to Celcius Process is completed" << endl << endl;
           cout << "Option 1: Convert Celcius to Fahrenheit" << endl;
           cout << "Option 3: Exit" << endl;
           cin >> xin;
           system("CLS");
       }
       else
       {
           cout << "Invalid Entry !" << endl;
           cout << "Option 1: Convert Celcius to Fahrenheit" << endl;
           cout << "Option 2: Convert Fahrenheit to Celcius" << endl;
           cout << "Option 3: Exit" << endl;
           cin >> xin;
           system("CLS");

       }
      
          

   }
   cout << "Exit from the program" << endl << endl;
   cout << "----------------------------------------------" << endl;
   cout << " End of ASSIGNMENT 6" << endl;
   cout << "----------------------------------------------" << endl;

}

Explanation / Answer

#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;

void myMenu() //first function for the menu
{
cout << "Option 1: Convert Celcius to Fahrenheit" << endl;
cout << "Option 2: Convert Fahrenheit to Celcius" << endl;
cout << "Option 3: Exit" << endl;
}
int myc2f() // second function converting the the file from celsius to fahrenheit
{
string line; // define
ifstream celcfile ("data_Celsius.txt"); // open and read the file
while (!celcfile.eof()) // read and convert the file values
{
getline(celcfile, line);
int value = atoi(line.c_str());
value = ((9 / 5)*value +32);
ofstream mycelc("Oja_Fahrenheit_Output.txt"); // output the converted values to a new file
cout << value << endl;
  
}
celcfile.close();
}
int myf2c()
{
string line2; // define
ifstream fahrfile("data_Fahrenheit.txt");
while (!fahrfile.eof()) // to read and convert the file from fahr to cels
{
getline(fahrfile, line2); //possibly here

       int value = atoi(line2.c_str());
value = ((value - 32)*(5/9));
ofstream mycelc("Oja_Celcius_Output.txt"); // create new file with the outputted conversion of celcius to fahrenheit
cout << value << endl;
cout<<"hello world"<<endl;
}
fahrfile.close();
}
int main()
{
cout << "----------------------------------------------" << endl;
cout << "Solution for ASSIGNMENT #" << endl;
cout << "----------------------------------------------" << endl << endl;
int xin;
myMenu();
cin >> xin; // get the users input command
system("CLS");
while (xin != 3)
{
if (xin == 1)
{
cout << "Celcius to Fahrenheit Process is initiated" << endl;
myc2f(); // initiate the conversion with the function
cout << "Celcius to Fahrentheit Process is completed" << endl << endl;
cout << "Option 2: Convert Fahrenheit to Celcius" << endl;
cout << "Option 3: Exit" << endl;
cin >> xin;
system("CLS");
}
else if (xin == 2)
{
cout << "Fahrenheit to Celcius Process is initiated" << endl;
myf2c(); // initiate the conversion with the function
cout << "Fahrenheit to Celcius Process is completed" << endl << endl;
cout << "Option 1: Convert Celcius to Fahrenheit" << endl;
cout << "Option 3: Exit" << endl;
cin >> xin;
system("CLS");
}
else
{
cout << "Invalid Entry !" << endl;
cout << "Option 1: Convert Celcius to Fahrenheit" << endl;
cout << "Option 2: Convert Fahrenheit to Celcius" << endl;
cout << "Option 3: Exit" << endl;
cin >> xin;
system("CLS");
}
  
  
}
cout << "Exit from the program" << endl << endl;
cout << "----------------------------------------------" << endl;
cout << " End of ASSIGNMENT 6" << endl;
cout << "----------------------------------------------" << endl;
}

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