// decksh assignments
x=10                          // number assignment
y=20
factor=2
what="hello world"            // string assignment

size=x/factor                 // assignment with binop
text x y what size            // use

y-=10                         // assignment operation			
size+=factor                  // assignment op, substitute
text x y what size            // use

for v=0 100 5                 // loop from 0 to 100 by 5
	line 100 v 0 v 0.1 "blue"
	line v 100 v 0 0.1 "red"
efor