I have some code to cout the line from file. and to use it to find word in the file.

ifstream bfile("test1.txt");

    for(int i=0;i<=4;i++)
    {bfile>> word[i];}  

    for(int i=0;i<=4;i++)
    {line = line+ "  " + word[i]; }
    cout<< line<<endl;

after that use find word in string to find or edit in the the line, then take back to the file.

Any other idea to easy understand. I read some other thread, and their idea quite confuse i can't understand.