c++ - How to get the whole line where a given word is and store it in a variable? -

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I'm starting in C ++ world, I have to get the full line where there are given words and it's a variable 

  This structure is in my TXT file: clients.txt 085958485 Roland Spellman rolandl@gmail.com 090545874 Kathleen Spellman Cathleen 1@hotmail.com 056688741 Gabriele Solis desperate@aol.com   
 The program request to enter the user's ID, the ID is always the first number or word in the line. The user then enters 090545874, the program should be able to find 090545874 in the text file and then get the full line where it is stored in a variable.  
 I know how to find a word in a text file, but I do not know how to go the whole line in a variable, so to store my variable at the end  
 Variable = 090545874 Kathleen Spellman Kathleen 1@hotmail.com 4878554  
 After that, I'm able to delete the entire line or record. I use this code to enter data in the text file  
  struct person {char id [10]; Four names [20]; Four last names [20]; Four emails [10]; } Client data; Offream clientfile; Clientsfile.open ("clientes.dat", IOS :: out | iOS :: app); If (clientsfile.is_open ()) {cout & lt; & Lt; "Enter ID" & lt; & Lt; Endl; CIN & gt; & Gt; Clientdata.id; Clientsfile & lt; & Lt; Clientdata.id & lt; & Lt; ""; Cout & lt; & Lt; "Enter name" & lt; & Lt; Endl; CIN & gt; & Gt; Datoscliente.name; Clientsfile & lt; & Lt; Clientdata.name & lt; & Lt; ""; Cout & lt; & Lt; "Enter last name" & lt; & Lt; Endl; CIN & gt; & Gt; Clientdata.lastname; Clientsfile & lt; & Lt; Clientdata.lastname & lt; & Lt; ""; Cout & lt; & Lt; "Enter last email" & lt; & Lt; Endl; CIN & gt; & Gt; Clientdata.email; Client file & lt; & Lt; Clientdata.email & lt; & Lt; "";   
 Then I request the EU to enter the ID and what I need to do is not find the ID only, it is to get the full line where the user has to enter 090545874, I need to find it in the text file, but I need to get the complete line in this case 090545874 Kathleen Spellman Catholine 1@hotmail.com, so I stored it in a new variable string new form. Sector is required; New semen = 090545874 Kathleen Spellman Cathleen 1@hotmail.com   
 
 
 To read one line at a time , You can  & lt; String & gt; Use the  std :: getline  function defined in the header <(I assume that you are also using  fstream  library):  
  #include & lt; Fstream & gt; #include & lt; String & gt; Int main (int argc, char ** argv) {std :: ifstream input_file ("file.txt"); Std :: string line; While {true} {std :: getline (input_file, line); If (input_file.fail ()) breaks; // process line now} Return 0; }   
 What's good about the  std :: getline  function, however, it allows for very clean syntax:  
  #include & lt; Fstream & gt; #include & lt; String & gt; Int main (int argc, char ** argv) {std :: ifstream input_file ("file.txt"); Std :: string line; While (std :: getline (input_file, line)) {// process line now} 0 returned; }

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