#include <iostream>
#include <stdio.h>
using namespace std;

// Declare a function for some cout printing
void print_cout();
// Declare a function for some printf printing
void print_printf();

int main()
{
  // First do cout printing
  print_cout();
  // Now do printf printing
  print_printf();

  return(0);
} 

void print_cout()
{
  cout << "My name is " << "David" << endl;
  cout << "Two times two is " << 2*2 << endl;
  cout << "2 / 3 = " << 2/3 << endl;
  cout << "2.0 / 3.0 = " << 2.0/3.0 << endl;
}

void print_printf()
{
  printf("My name is %s\n", "David");
  printf("Two times two is %d\n", 2*2);
  printf("2/3 = %d\n", 2/3);
  printf("2.0/3.0 = %.2f\n", 2.0/3.0);
}