#include
#include
using namespace std;
int main() {
string str1 = “Hello”;
string str2 = “World”;
string str3;
int len;
// copy str1 into str3
str3 = str1;
cout << "str3 : " << str3 << endl;
// concatenates str1 and str2
str3 = str1 + str2;
cout << "str1 + str2 : " << str3 << endl;
// total length of str3 after concatenation
len = str3.size();
cout << "str3.size() : " << len << endl;
// compare two strings
cout << "str1 is lexically " << (str1.compare(str2)) << " away from str2" << endl;
return 0;
}