#include <algorithm>
#include <cassert>
#include <iostream>
#include <iterator>
#include <vector>
 
void multiplyVectors(std::vector<float> &v1, std::vector<float> &v2)
{
    assert(v1.size() <= v2.size());
 
    std::transform(v1.begin(), // start of first input range
                   v1.end(),   // end of first input range
                   v2.begin(), // start of **second input** range
                   v2.begin(), // start of **output** range
                   std::multiplies<float>());
}
 
int main()
{
    std::vector<float> v1{1.0, 2.0, 3.0};
    std::vector<float> v2{1.0, 2.0, 3.0};
 
    multiplyVectors(v1, v2);
    std::copy(std::begin(v2), std::end(v2),
              std::ostream_iterator<float>(std::cout, "\n"));
}

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