YENGconstant

Revision as of 22:37, 19 September 2020

constant allows to define a constant value that is evaluated and all its occurrences in code are replaced by that value at compile time.
its type will be guessed from the types at right side expression, and can be confusing

constant endlimit = 0.1 // will be a like float 0.1
constant start = 1 // will be a like integer 1
constant idea = 2 + 3 // will be like integer 5
constant betteridea = idea + 3 // will be like integer 8
constant otheridea = 2 + 3.0 // will be like float 5.0
constant badidea = "2" + 3 // will be like string "23"

other operations supported

& | ^ ~ for integer types
- * / % for integer or float types

on expressions better use () to force and make clear the desired evaluation order

constant ar = 2 + (2 & 1); //will be 2
constant ar = 2 + 2 & 1; //will be 0, ie will do (2 + 2) & 1 since + and & have same evaluation priority.

normal use will to define a simple constant at top of program, easy to change later.

constant textureID = "0d3b69fe-1b6e-40f3-8e5f-933814df3b7b";