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== 0return 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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