XpandNotes

exploring the intersection of technology and creativity

Variables

Naming Variables C++ encourages user declare meaningful variables. For instance, to express “cost of trip”, the corresponding variable can be named as cost_of_trip or CostOfTrip, instead of cot, x...

Posted by blueskyson on February 16, 2020

C++ Beginning

main() Function 1 2 3 4 5 int main() //function heading { statements return 0; } A function has two parts. One is called function heading. The first word int is call return type, indicati...

Posted by blueskyson on February 16, 2020

Positional Notation

The conversion of positional notation is quite important in computer science since the data are stored as binary signals in disks and memories. We must convert them into decimal so as to make use o...

Posted by blueskyson on February 15, 2020

Two Circles Touch Externally

This post is for solving the intersections of two circles. Suppose the radius of $ C_1 $ is $ r_1 $, and the radius of $ C_2 $ is $ r_2 $. Let $ θ $ be the angel between $ \overline{A C} $ and hor...

Posted by blueskyson on February 14, 2020