arithmetic and math operators

arithmetic and match operators that take 2 operands

operand1	operand2	operator	result in stack	comment
1	2	add	3
5	3	div	1.667
5	3	idiv	1
5	3	mod	2
1.2	2	mul	2.2
2.3	0.3	sub	2.0
2	2	atan	45	arctangent in degree
1	2	atan	26.5651
0	2	atan	0
2	3	exp	8.0	raise base 2 to exponent 3

arithmetic and match operators that take 1 operand

operand	operator	result in stack
-3	abs	3
2	neg	-2
1.1	ceiling	2.0
1.1	floor	1.0
1.0	ceiling	1.0
1.0	floor	1.0
4.5	round	5.0
4.49	round	4.0
4.9	truncate	4.0
4.0	truncate	4.0
2	sqrt	1.41421
30	sin	0.5
60	sin	0.866
30	cos	0.866
60	cos	0.5
2.718	ln	0.999
10	log	1.0
100	log	2.0

rand number generator

10 srand  %set random number seed to 10
rand  = % stack: 168070
rand  = % stack: 677268843
10 srand % reset the seed
rand = %stack: 168070  the same first random number of the seed
rrand  %stack: 10. return the random number seed