[ новости /+++ | форум | теги | ]

NAME

     integer - Perl pragma to compute arithmetic in integer
     instead of double



SYNOPSIS
         use integer;
         $x = 10/3;
         # $x is now 3, not 3.33333333333333333




DESCRIPTION
     This tells the compiler to use integer operations from here
     to the end of the enclosing BLOCK.  On many machines, this
     doesn't matter a great deal for most computations, but on
     those without floating point hardware, it can make a big
     difference.

     Note that this affects the operations, not the numbers.  If
     you run this code

         use integer;
         $x = 1.5;
         $y = $x + 1;
         $z = -1.5;

     you'll be left with `$x == 1.5', `$y == 2' and `$z == -1'.
     The $z case happens because unary `-' counts as an
     operation.

     Native integer arithmetic (as provided by your C compiler)
     is used.  This means that Perl's own semantics for
     arithmetic operations may not be preserved.  One common
     source of trouble is the modulus of negative numbers, which
     Perl does one way, but your hardware may do another.

       % perl -le 'print (4 % -3)'
       -2
       % perl -Minteger -le 'print (4 % -3)'
       1

     See the Pragmatic Modules entry in the perlmod manpage.









Поиск по тексту MAN-ов: 


























Партнёры:










Хостинг:










Закладки на сайте

Проследить за страницей


Created 1996-2024 by Maxim Chirkov

Добавить, Поддержать, Вебмастеру