Use string overloaded subscript operator to create lvalue - C++ STL

Description

Use string overloaded subscript operator to create lvalue

Demo Code

#include <iostream> 
#include <string> 
using namespace std; 

int main() //from w w w.  j  a  v  a2 s. c  o m
{ 
    string s1( "happy" ); 
    string s2( " birthday" ); 
    string s3; 

   // Use string copy constructor 
   string s4( s1 ); 

   s1[ 0 ] = 'H'; 
   s1[ 6 ] = 'B'; 
   cout << "\ns1 after s1[0] = 'H' and s1[6] = 'B' is: " << s1 << "\n\n"; 


}

Result

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