Matrix

[agonfetiu]

I have a table of 250 patients divided in categories of age and blood pressure. I need to write a c++ program that will tell the number of each age group and each blood pressure group ( there are 3 age groups and 5 blood pressure groups).

[Duthomhas]

This is a "find max/min element" kind of problem.

You'll need a std::map<age,count> to histogram your data.

Loop through all the patients. For each one, get his age, and update the histogram:

  // histogram the ages of the patients
  std::map <unsigned, unsigned> ages;
  for (each patient)
  {
    ages[ patient.age ] += 1;
  }

  // display the number of patients for each age
  for (auto info : ages)
  {
    cout << "There are " << info.second << " patients who are " << info.first << " years old.\n";
  }

It works the same way with blood pressures. (You can even combine the loops.)

Good luck!