CppExerciseNoForLoopsAnswer17.md

 

 

 

 

 

(C++) Answer of exercise #9: No for-loops #17

 

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

 

 

 

 

 

Question #17: Halve

 

Replace the for-loop. You will need:

• std::bind2nd
• std::divides
• std::transform

 

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#include <vector> void Halve (std::vector<double>& v) {   const int sz = static_cast<int>(v.size());   for (int i=0; i!=sz; ++i)   {     v[i]/=2.0;   } }

 

 

 

 

 

Answer

 

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#include <algorithm> #include <numeric> #include <vector> //From http://www.richelbilderbeek.nl/CppHalve.htm void Halve (std::vector<double>& v) {   std::transform(v.begin(),v.end(),v.begin(),     std::bind2nd(std::divides<double>(),2.0)); }