/* This program demonstrates the sizes of various atomic data types.
 * It also shows how to declare and intialize some integer and double values.
 */

#include<iostream>
using namespace std;

int main()
{
	cout<< "The size of bools is "<< sizeof(bool)<<endl;
	cout<<"The size of char is "<< sizeof(char)<<endl;
	cout<<"The size of short is "<< sizeof(short)<<endl;
	cout<<"The size of long is "<< sizeof(long)<<endl;
	cout<<"The size of float is "<< sizeof(float)<<endl;

	//declare and initialize an integer
	int num = 5;

	cout<<"The size of the integer variable num is "<< sizeof(num)<<". Its value is "<<num<<endl;

	//declare a constant double
	const double PI = 3.141529;

	cout<<"The size of the double variable pi is "<< sizeof(PI)<<". Its value is "<<PI<<endl;
	//try to change a constant. Error.
	PI = 3;

	//declare and initialize a double in scientific notation.
	double e = 1.8e-18;

	cout<<e<<endl;

}