class scope s
method scope s
block scope
hello from main
hello
world

new hello from main
new world from main

hello1
world1
another greeting
default greeting
the value of pi in Math is 3.14159265358979
the value of pi in Math is 3.14159265358979
the value of e in Math is 2.71828182845905
sqrt2^2 = 2
1/2 = 0
1.0/2 = 0.5