The value HUGE_VAL, a value larger than or equal to any other numerical value.
Returns the arc tangent of y/x (in radians), but uses the signs of both parameters to find the quadrant of the result. (It also handles correctly the case of x being zero.)
Returns the remainder of the division of x by y that rounds the quotient towards zero.
Returns m and e such that x = m2^e, e is an integer and the absolute value of m is in the range [0.5, 1) (or zero when x is zero).
This function is an interface to the simple pseudo-random generator function rand provided by ANSI C. (No guarantees can be given for its statistical properties.)
When called without arguments, returns a uniform pseudo-random real number in the range [0,1).
When called with an integer number
m, returns a uniform pseudo-random integer in the range [1, m].
When called with two integer numbers
n, returns a uniform pseudo-random integer in the range [m, n].
x as the "seed" for the pseudo-random generator: equal seeds produce equal sequences of numbers.