Question

How to multiply two vectors in C++

Answer 1

#include <iostream>
#include <vector>

std::vector<int> multiplyVectors(const std::vector<int>& vec1, const std::vector<int>& vec2) {
    std::vector<int> result(vec1.size());
    
    for (size_t i = 0; i < vec1.size(); ++i) {
        result[i] = vec1[i] * vec2[i];
    }
    
    return result;
}

int main() {
    std::vector<int> vec1 = {1, 2, 3, 4};
    std::vector<int> vec2 = {5, 6, 7, 8};

    std::vector<int> result = multiplyVectors(vec1, vec2);

    for (int val : result) {
        std::cout << val << " ";
    }
}


/*
run:

5 12 21 32 

*/

 

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