c-resources/CPlusPlus20ForProgrammers-m.../examples/ch02/fig02_06.cpp

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// fig02_06.cpp
// Standard library string class test program.
#include <iostream>
#include <string>
using namespace std;
int main() {
string s1{"happy"};
string s2{" birthday"};
string s3; // creates an empty string
// display the strings and show their lengths (length is C++20)
cout << "s1: \"" << s1 << "\"; length: " << s1.length()
<< "\ns2: \"" << s2 << "\"; length: " << s2.length()
<< "\ns3: \"" << s3 << "\"; length: " << s3.length();
// compare strings with == and !=
cout << "\n\nThe results of comparing s2 and s1:" << boolalpha
<< "\ns2 == s1: " << (s2 == s1)
<< "\ns2 != s1: " << (s2 != s1);
// test string member function empty
cout << "\n\nTesting s3.empty():\n";
if (s3.empty()) {
cout << "s3 is empty; assigning to s3;\n";
s3 = s1 + s2; // assign s3 the result of concatenating s1 and s2
cout << "s3: \"" << s3 << "\"";
}
// testing new C++20 string member functions
cout << "\n\ns1 starts with \"ha\": " << s1.starts_with("ha") << "\n";
cout << "s2 starts with \"ha\": " << s2.starts_with("ha") << "\n";
cout << "s1 ends with \"ay\": " << s1.ends_with("ay") << "\n";
cout << "s2 ends with \"ay\": " << s2.ends_with("ay") << "\n";
}
/**************************************************************************
* (C) Copyright 1992-2022 by Deitel & Associates, Inc. and *
* Pearson Education, Inc. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
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* to determine their effectiveness. The authors and publisher make *
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**************************************************************************/