O’Reilly Books Latest LAMP Titles: mod_perl Pocket Reference (Make web site)
O’Reilly Books Latest LAMP Titles: mod_perl Pocket Reference SQL in a Nutshell Network Printing Books by topic: Linux Open Source Security System and Network Administration Unix Web and Internet O’Reilly Network Technologies: ONJava.com ONLamp.com openp2p.com Perl.com XML.com Apache BSD Java Javascript and CSS Linux Mac Mozilla .NET P2P Perl Policy PHP Python Web Services Wireless same program you may name a variable, an array, and a function using the same letter. The following identifiers would not conflict: x Variable x. x[i] Element i of array x. i can range from 0 to 2047 and can also be an expression. x(y,z) Call function x with parameters y and z. Input-output keywords ibase, obase, scale, and last store a value. Typing them on a line by themselves displays their current value. You can also change their values through assignment. The letters A-F are treated as digits whose values are 10-15. ibase = n Numbers that are input (e.g., typed) are read as base n (default is 10). obase = n Numbers that are displayed are in base n (default is 10). Note: Once ibase has been changed from 10, use A to restore ibase or obase to decimal. scale = n Display computations using n decimal places (default is 0, meaning that results are truncated to integers). scale is normally used only for base-10 computations. last Value of last printed number. Statement keywords A semicolon or a newline separates one statement from another. Curly braces are needed when grouping multiple statements. if (rel-expr) {statements} [else {statements}] Do one or more statements if relational expression rel-expr is true. Otherwise, do nothing, or if else (an extension) is specified, do alternative statements. For example: if(x==y) {i = i + 1} else {i = i - 1} while (rel-expr) {statements} Repeat one or more statements while rel-expr is true; for example: while(i>0) {p = p*n; q = a/b; i = i-1}
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