Question

How to pass string by reference in C++

Answer 1

#include <iostream>

void f(std::string &str) {
    str[0] = 'F';
    
    str[5] = 'W';
}
int main()
{
    std::string str = "C++ Programming";
    
    f(str);
    
    std::cout << str;
}




/*
run:

F++ PWogramming

*/

 

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Answer 2

#include <iostream>

void f(std::string &str) {
    str = "C Pro";
}
int main()
{
    std::string str = "C++ Programming";
    
    f(str);
    
    std::cout << str;
}




/*
run:

C Pro

*/

 

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