Question

How to increase the size of a vector in C++

Answer 1

#include <iostream>
#include <vector>

void print(std::vector<double> vec) {
    for (std::size_t i(0), len(vec.size()); i != len; i++) {
        std::cout << vec[i] << " ";
    }
    std::cout << "\n";
}

int main() {
    std::vector<double> vec;

    // push_back add values to the end of the vector, 
    // and it will automatically resize the vector
    
    vec.push_back(12);
    vec.push_back(3);
    vec.push_back(19);
    vec.push_back(0);

    print(vec);
    
    vec.push_back(600);
    vec.push_back(3.14);
    vec.push_back(4000);
    
    print(vec);
}
  
  
/*
run:
   
12 3 19 0 
12 3 19 0 600 3.14 4000 
   
*/

 

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