lower_bound and upper_bound in c++ code example

Example 1: C++ and endl

// endl example
#include <iostream>     // std::cout, std::end
using namespace std;
int main () {

  int a=100;
  double b=3.14;

  cout << a;
  cout << endl;              // manipulator inserted alone
  cout << b << endl << a*b;  // manipulator in concatenated insertion
  endl (cout);               // endl called as a regular function

  return 0;
}

Example 2: floor() in c++

floor(x):This function in C++ returns the smallest possible integer value which is smaller
 than or equal to the given argument.
Input : 2.5 ,-2.1 ,2.9
Output : 2 ,-3, 2