Question

How to pass vector to function in C++

Answer 1

#include <iostream>
#include <vector>

using namespace std;

void add_number(vector<int> vec) { 
   vec.push_back(4); 
} 
   
int main() 
{ 
    vector<int> vec; 
    
    vec.push_back(1); 
    vec.push_back(2); 
    vec.push_back(3); 
   
    add_number(vec); 
   
    for(auto const& v : vec) cout << v << " ";
   
    return 0; 
} 


/*
run:

1 2 3 

*/

 

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Answer 2

#include <iostream>
#include <vector>

using namespace std;

void add_number(vector<int> &vec) { 
   vec.push_back(4); 
} 
   
int main() 
{ 
    vector<int> vec; 
    
    vec.push_back(1); 
    vec.push_back(2); 
    vec.push_back(3); 
   
    add_number(vec); 
   
    for(auto const& v : vec) cout << v << " ";
   
    return 0; 
} 


/*
run:

1 2 3 4 

*/

 

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