Real constants and functions: Difference between revisions

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 <perl>use POSIX;
-sqrt(x); #square root
+exp(1); # e
+* atan2(1, 1); # pi
-log(x); #natural logarithm
-exp(x); #exponential
+sqrt($x); # square root
+log($x); # natural logarithm
-abs(x); #absolute value
+exp($x); # exponential
-POSIX::floor(x); #floor
+abs($x); # absolute value
-POSIX::ceil(x); #ceiling
+POSIX::floor($x); # floor
-x ** y; #power</perl>
+POSIX::ceil($x); # ceiling
+$x**$y; # power</perl>
 =={{header|PHP}}==