example1_basic_operations.cpp

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#include <iostream>
#include <string>

int main() {
    std::string s1 = "Hello";
    std::string s2 = " World";
    
    // Concatenation
    std::string s3 = s1 + s2;
    
    // Substring
    std::string sub = s3.substr(0, 5);
    
    // Length
    size_t len = s3.length();
    
    std::cout << "Concatenated: " << s3 << std::endl;
    std::cout << "Substring: " << sub << std::endl;
    std::cout << "Length: " << len << std::endl;
    
    return 0;
}