This is the answer of Exercise #9: No for-loops.

Question #9: Product of std::vector<int>

Replace the for-loop. You will need:

std::accumulate
std::multiplies


#include <vector>

 

int Product(const std::vector<int>& v)

{

  const int sz = static_cast<int>(v.size());

  int product = 1;

  for (int i=0; i!=sz; ++i)

  {

    product*=v[i];

  }

  return product;

}

Answer


#include <algorithm>

#include <numeric>

#include <vector>



int Product(const std::vector<int>& v)

{

  return std::accumulate(v.begin(),v.end(),1,std::multiplies<int>());

}

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(C++) Answer of exercise #9: No for-loops #9

Question #9: Product of std::vector<int>

Answer