#include <iostream>
#include <string>
using namespace std;
// constant begins with 0, represent octal (base 8) value
// constant begins with 0x represent hexa ( base 16)
int main()
{
	int n1, x1,y1,z1;
	int oct1, hex1; 
	 // octal base starts with 0
	  x1 =022; oct1 = 017;
	 // octa 8 *2 + 2 = 18; 
	 // * operataion preceds over + 
	cout << "\n what is oct 022 : " << x1; 
	// octa 8 * 1 + 7 = 15 
	cout <<"\n  what is oct 017 : "  << oct1;
	// hexadecimal base constant begins with 0x
	hex1 = 0x1F; y1 = 0x1B;
	z1 = 0x2B; 	 n1 = 0xB; // = 11; 
	//cout << "\n what is oct 022 : " << hex << 0x22; 
	cout << "\n what is 0xB : " << n1; 
	// 16 * 1 + 11= 27
	cout << "\n what is 0x1B : " <<  y1; 
	// 16 * 2 + 11 = 43
	cout << "\n what is 0x2B : " <<  z1;
	// 16 * 1 + 15 = 31 ; F = 15
	cout <<"\n what is 0x1F : " << hex1;
	return 0; 
}