Question

How to pass vector by reference in C++

Answer 1

#include <iostream>
#include <vector>

void print(const std::vector<int>& vec) {
    for (const auto& element : vec) {
        std::cout << element << " ";
    }
    std::cout << "\n";
}

void change(std::vector<int>& vec) { 
    vec[3] = 100; 
}
 
int main()
{
    std::vector<int> vec{ 1, 3, 8, 23, 99, 12, 37, 7 };
    
    print(vec);
 
    change(vec);
    
    print(vec);
}
 
 
/*
run:
 
1 3 8 23 99 12 37 7 
1 3 8 100 99 12 37 7 
 
*/

 

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