#include<iostream>
#include<fstream>
using namespace std;
 
void main(){
char firstname[10], lastname[10];
int age;
 
ofstream write("text.txt", ios::app);/*actually i am not sure what ios::app does*/
 
cout<<"firstname: ";
cin.getline(firstname,sizeof(firstname));
cout<<"last name: ";
cin.getline(lastname,sizeof(lastname));
cout<<"age: ";
cin>>age;
cin.ignore();
 
write<<firstname<<endl;
write<<lastname<<endl;
write<<age<<endl;
}

string inStr;
string searchFor = "hello";
ostream in ("test.txt");
 
while (getline (in, inStr))
{
    if (inStr == searchStr)
    {
        //process
    }
}