count_if(): A unary predicate that determines if number is divisible by 3 : count_if « STL Algorithms Non modifying sequence operations « C++ Tutorial

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C++ Tutorial » STL Algorithms Non modifying sequence operations » count_if

25.5.2.count_if(): A unary predicate that determines if number is divisible by 3

#include <iostream>

#include <vector>

#include <algorithm>

using namespace std;

   



bool dividesBy3(int i)

{

  if((i%3) == 0) return true;

   

  return false;

}

   

int main()

{

  vector<int> v;

  int i;

   

  for(i=1; i < 20; i++) v.push_back(i);

   

  for(i=0; i<v.size(); i++)

    cout << v[i] << endl;

   

  i = count_if(v.begin(), v.end(), dividesBy3);

  cout << i << " numbers are divisible by 3.\n";

   

  return 0;

}

25.5.count_if
	25.5.1.	Use std::count_if to count number of elements in vector that are greater than 9
	25.5.2.	count_if(): A unary predicate that determines if number is divisible by 3

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