Find and Modify txt File in 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.

jfly · Accepted Answer · 2014-01-19 06:32:35Z

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; } } }

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