Perl Pocket Reference, 4th Edition

Chapter 17. Arithmetic Functions

abs expr†

Returns the absolute value of its operand.

atan2 y, x

Returns the arctangent of y/x in the range to .

cos expr†

Returns the cosine of expr (expressed in radians).

exp expr†

Returns e to the power of expr.

int expr†

Returns the integer portion of expr.

log expr†

Returns the natural logarithm (base e) of expr.

not expr

Logically negates the truth value of expr.

rand [ expr ]

Returns a random fractional number between 0 (inclusive) and the value of expr (exclusive). If expr is omitted, it defaults to 1.

sin expr†

Returns the sine of expr (expressed in radians).

sqrt expr†

Returns the square root of expr.

srand [ expr ]

Sets the random number seed for the rand operator.

time

Returns the number of non-leap seconds since whatever time the system considers to be the epoch. Suitable for feeding to gmtime and localtime.