floor(5.5)	floor(-5.5)
5	-6
ceiling(5.5)	ceiling(-5.5)
6	-5
truncate(52.64,1)	truncate(52.64,2)	truncate(52.64,-1)	truncate(52.64,-2)
52.6	52.64	50	0
round(5.5)	round(-5.5)
6	-6
round(5.64,1)	round(5.64,2)	round(5.64,-1)	round(5.64,-2)
5.6	5.64	10	0
abs(-10)	sign(-5)	sign(5)	sign(0)
10	-1	1	0
log(exp(10))	exp(log(sqrt(10))*2)
10.000000	10.000000
pow(10,log10(10))	power(2,4)
10.000000	16.000000
rand(999999)	rand()
0.18435012473199	0.76373626176616
PI()	sin(pi()/2)	cos(pi()/2)	abs(tan(pi()))	cot(1)	asin(1)	acos(0)	atan(1)
3.141593	1.000000	0.000000	0.000000	0.64209262	1.570796	1.570796	0.785398
degrees(pi())	radians(360)
180	6.2831853071796