example2_function_parameters.cpp

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#include <iostream>
#include <string>

void modifyString(std::string& str) {
    str += " World!";
}

int main() {
    std::string message = "Hello";
    
    std::cout << "Before function call: " << message << std::endl;
    
    modifyString(message);
    
    std::cout << "After function call: " << message << std::endl;

    return 0;
}