Trouble reading next line from a file

Question

I'm trying to make a C++ program which finds a specific line in a text file and then reads the next 3 line of that file. But the program is ending up showing the same line three times.What could be a possible fix for this? Here is my code-

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main()
{
    ifstream file("file.txt");
    string line;
    int iffound=0;
    string inp;

    cin>>inp;
    cout << "You have searched for " << inp << endl;

    while (file.good())
    {
        getline(file,line);
        if(line==inp){
            iffound=1;
            cout << "Contact Found!" << endl;
            for(int i=0;i<=2;i++){
                cout << line;
            }
            break;
        }
    }
    file.close();

    if(iffound!=1){
        cout << "Contact Not Found" << endl;
    }
    return 0;
}

Here is my text file (file.txt)

123456
User1
Available
Active

789456
User2
Not Available
Active

Well, after you found your line, you have a for loop that prints the same variable, over and over again. A computer will always do exactly what you tell it to do, instead of what you want it to do, unfortunately. — Sam Varshavchik, Sep 12 '16 at 15:38
[FYI] Do not use `while (file.good())`. It is just like `while (file.eof())`: http://stackoverflow.com/questions/5605125/why-is-iostreameof-inside-a-loop-condition-considered-wrong — NathanOliver, Sep 12 '16 at 15:39

score 1 · Answer 1 · answered Sep 12 '16 at 15:39

1

Well you are not reading the following two lines with getline if you found your occurence. Basically, you are missing the getline in your for

answered Sep 12 '16 at 15:39

Ceros

491
3
14

I used `for(int i=0;i<=2;i++){ getline(file,line); cout << line; }` and now working fine. Thanks! :) – Abdullah Shahriar Sep 12 '16 at 15:44

Aganju · Accepted Answer · 2016-09-12T15:43:37.723

1

Your inner loop does no more reading, it just prints it 3 times:

                 for(int i=0;i<=2;i++){
                    cout << line;
                 }

If you want the code to keep reading more lines, you need to put the reading inside that loop too:

                 for(int i=0;i<=2;i++){
                    getline(file,line);
                    cout << line;
                 }

edited Sep 12 '16 at 15:43

answered Sep 12 '16 at 15:39

Aganju

6,295
1
12
23

An example will help me understand better – Abdullah Shahriar Sep 12 '16 at 15:40
replacing my code with `for(int i=0;i<=2;i++){ getline(file,line); cout << line < – Abdullah Shahriar Sep 12 '16 at 15:49

Trouble reading next line from a file

2 Answers2