Number of elements greater than 9: count_if and greater() : random_shuffle « STL Algorithms Modifying sequence operations « C++ Tutorial

1. C++ Tutorial
2. STL Algorithms Modifying sequence operations
3. random_shuffle

#include <iostream>
#include <algorithm>
#include <numeric>
#include <vector>

using namespace std;

bool greater9( int );

int main()
{
   const int SIZE = 10;
   int a1[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
   vector< int > v( a1, a1 + SIZE );

   random_shuffle( v.begin(), v.end() );

   int a2[] = { 100, 2, 8, 1, 50, 3, 8, 8, 9, 10 };
   vector< int > v2( a2, a2 + SIZE );
 
   int result = count_if( v2.begin(), v2.end(), greater9 );
   cout << "\nNumber of elements greater than 9: " << result;

   return 0;
}

bool greater9( int value ) { return value > 9; }