tailieunhanh - HandBooks Professional Java-C-Scrip-SQL part 241

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 241', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Returns true if c is greater than other . c other returns a positive number . c other Returns true if c is greater than or equal to other . c other returns either a positive number or 0 . c other Returns true if the objects are equal . c other returns 0 . min max Returns true if c is between min and max. Math Module of math functions The Math module provides a collection of math functions. The Math module defines private instance methods and module methods that possess the same name and definition. Module Functions atan2 x y Calculates the arc tangent. cos x Calculates the cosine of x. exp x Calculates an exponential function e raised to the power of x . frexp x Returns a two-element array containing the nominalized fraction and exponent of x. ldexp x exp Returns the value of x times 2 to the power of exp. log x Calculates the natural logarithm of x. log10 x Calculates the base 10 logarithm of x. sin x Calculates the sine of x. sqrt x Returns the square root of x. x must be positive. tan x Calculates the tangent of x. Constants E e the base of natural logarithms pi the Ludolphian number Operating System Services Ruby s portability necessitates some level of abstraction between your Ruby scripts and the underlying operating system. Abstractions of I O filesystems and processes are provided through the Ruby built-in classes IO File File Stat FileTest Dir and Process. IO I O class IO is object-oriented representation of stdio. IO is a superclass of other IO related classes such as File BasicSocket etc. Included Module Enumerable Class Methods IO foreach path x . Opens the file and executes the block once for each line closing the file when the block exits. n 1 IO foreach path line print n lib n 1 IO new fd mode r Returns a new IO stream for the specified integer file descriptor fd. IO pipe Creates a pair of IO streams connected to each other and returns them as an array readIO writeIO . IO popen cmd mode r IO popen cmd mode r io .