#include <iostream>
#include <string>

int main()
{
   std::string a;
   std::string b("hello");

   std::cout << "Enter a word to compare: ";
   std::cin >> a;

   if (a == b)
   {
      std::cout << "Equal\n";
   }
   else
   {
      std::cout << "Not equal\n";
   }
}

#include <iostream>
#include <string>
#include <cstring>

int main()
{
    std::string str = "this is a string" ;
    str[7] = 0 ;
    const char* cstr = str.c_str() ;
    const char* substr = "str" ;

    std::cout << "C++: len == " << str.size() << '\n' // 16
              << "  C: len == " << std::strlen(cstr) << '\n' // 7
              << "C++: " << ( str.find(substr) != str.npos ? "found" : "didn't find" ) << " substring '" << substr << "'\n" // found
              << "  C: " << ( std::strstr(cstr,substr) ? "found" : "didn't find" ) << " substring '" << substr << "'\n" ; // didn't find
}

#include <iostream>
#include <string>
using namespace std;
int main()
{
   string a, b;
   cout << "Enter a: ";   getline( cin, a );
   cout << "Enter b: ";   getline( cin, b );
   cout << ( a == b ? "Matched" : "Not matched" ) << '\n'; 
}