C++ language introduction 16– String class

The C++ standard library provides the string class type to support all of the above operations

#include <iostream>
#include <string>
 
using namespace std;
 
int main (a)
{
   string str1 = "Hello";
   string str2 = "World";
   string str3;
   int  len ;
 
   // copy str1 to str3
   str3 = str1;
   cout << "str3 : " << str3 << endl;
 
   // connect str1 and str2
   str3 = str1 + str2;
   cout << "str1 + str2 : " << str3 << endl;
 
   // The total length of str3 after connection
   len = str3.size(a); cout <<"str3.size() : " << len << endl;
 
   return 0;
}
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Operation results: