Cpp - String String Concatenating

Introduction

The string class supports the operators + and += for concatenating, and the operators ==, !=, <, <=, >, and >= for comparing strings.

You can use the + operator to concatenate strings, that is, to join those strings together.

string sum, s1("sun"), s2("flower"); 
sum = s2 + s3; 

The code above concatenates the strings s1 and s2. The result, "sunflower" is then assigned to sum.

Two strings concatenated using the + operator will form an expression of the string type.

      
string s1("sun"),s2("flower"),s3("seed"); 
cout << s1 + s2 + s3; 
string s("Good morning "); 
cout << s + " test" + '!'; 

The following code reads several lines of text and outputs in reverse order.

Demo

#include <iostream> 
#include <string> 
using namespace std; 
string prompt("Please enter some text!\n"), 
        line( 50, '-'); 
int main() /*from   www .j ava 2  s . c  o m*/
{ 
   prompt+="Terminate the input with an empty line.\n "; 
   cout << line << '\n' << prompt << line << endl; 
   string text, line;          // Empty strings 
   while( true) 
    { 
       getline( cin, line);     // Reads a line of text 
       if( line.length() == 0)  // Empty line? 
         break;                 // Yes ->end of the loop 

       text = line + '\n' + text;   // Inserts a new 
                                     // line at the beginning. 
    } 
                                           // Output: 
   cout << line << '\n' 
         << "Your lines of text in reverse order:" 
         << '\n' << line << endl; 
   cout << text << endl; 
   return 0; 
}

Result