how to use ofstream to put values of the same variables in a file in c++ using function code example

Example 1: file reading c++

int a, b;
    
ifstream bd; 
myfile.open("file.txt");

if (myfile.is_open())
	while (bd >> a >> b)
    	cout << a << b << endl;

else cout << "ERROR";

Example 2: fstream read write mode

stream file;
file.open(fileName,ios::in | ios::out);