Find and Modify txt File in C++ - c++

Question

I want to find a specific id from file and modify content.
Here is originol code which I want.
// test.txt
id_1
arfan
haider
id_2
saleem
haider
id_3
someone
otherone
C++ Code:
#include <iostream>
#include <fstream>
#include <string>
using namesapce std;
int main(){
istream readFile("test.txt");
string readout;
string search;
string Fname;
string Lname;
cout<<"Enter id which you want Modify";
cin>>search;
while(getline(readFile,readout)){
if(readout == search){
/*
id remain same (does not change)
But First name and Last name replace with
user Fname and Lname
*/
cout<<"Enter new First name";
cin>>Fname;
cout<<"Enter Last name";
cin>>Lname;
}
}
}
Suppose:
A user search id *id_2*. After that user enter First name and Last name Shafiq and Ahmed.
After runing this code the test.txt File must modify the record like that:
...............
...............
id_2
Shafiq
Ahmad
.................
.................
Only id_2 record change remaing file will be same.
UPDATE:
#include <iostream>
#include <string.h>
#include <fstream>
using namespace std;
int main()
{
ofstream outFile("temp.txt");
ifstream readFile("test.txt");
string readLine;
string search;
string firstName;
string lastName;
cout<<"Enter The Id :: ";
cin>>search;
while(getline(readFile,readLine))
{
if(readLine == search)
{
outFile<<readLine;
outFile<<endl;
cout<<"Enter New First Name :: ";
cin>>firstName;
cout<<"Enter New Last Name :: ";
cin>>lastName;
outFile<<firstName<<endl;
outFile<<lastName<<endl;
}else{
outFile<<readLine<<endl;
}
}
}
It also contain pervious First Name and Last Name in temp.txt file.

Answer 1

After finding the specific id and writing the new first name and last name, you need to skip the following two lines. This code works:
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
void skipLines(ifstream& stream, int nLines)
{
string dummyLine;
for(int i = 0; i < nLines; ++i)
getline(stream, dummyLine);
}
int main()
{
ofstream outFile("temp.txt");
ifstream readFile("test.txt");
string readLine;
string search;
string firstName;
string lastName;
cout<<"Enter The Id :: ";
cin>>search;
while(getline(readFile,readLine))
{
if(readLine == search)
{
outFile<<readLine;
outFile<<endl;
cout<<"Enter New First Name :: ";
cin>>firstName;
cout<<"Enter New Last Name :: ";
cin>>lastName;
outFile<<firstName<<endl;
outFile<<lastName<<endl;
skipLines(readFile, 2);
}
else
{
outFile<<readLine<<endl;
}
}
}