c-resources/CPlusPlus20ForProgrammers-master/examples/ch06/fig06_08.cpp

// fig06_08.cpp
// Poll analysis program.
//#include <format> // C++20: This will be #include <format>
#include <iostream>
#include <array>

int main() {
   // place survey responses in array responses
   constexpr std::array responses{
      1, 2, 5, 4, 3, 5, 2, 1, 3, 1, 4, 3, 3, 3, 2, 3, 3, 2, 2, 5};

   // initialize frequency counters to 0
   constexpr size_t frequencySize{6}; // size of array frequency
   std::array<int, frequencySize> frequency{};

   // for each response in responses, use that value 
   // as frequency index to determine element to increment
   for (const int& response : responses) {
      ++frequency[response];//.at(response);
   }
   
   std::cout << "Rating   Frequency  \n";

   // output each array element's value
   for (size_t rating{1}; rating < frequency.size(); ++rating) {
      std::cout << rating << " " << frequency.at(rating) << "\n";
   }
}


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