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syntax:arith_expr [2012/11/02 18:00] techlivezheng [Arithmetic expressions and return codes] Fix a mistake |
syntax:arith_expr [2017/02/11 14:22] (current) fgrose [Table] meaning of ternary operator |
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| These expressions are evaluated following some rules described below. The operators and rules of arithmetic expressions are mainly derived from the C programming language. | These expressions are evaluated following some rules described below. The operators and rules of arithmetic expressions are mainly derived from the C programming language. | ||
| - | This article describes the theory of the used syntax and the behaviour. To get practical examples without big explanations, see [[http://wooledge.org/mywiki/ArithmeticExpression | the article on Greg's wiki]]. | + | This article describes the theory of the used syntax and the behaviour. To get practical examples without big explanations, see [[http://mywiki.wooledge.org/BashGuide/CompoundCommands#Arithmetic_Evaluation | this page on Greg's wiki]]. |
| ===== Constants ===== | ===== Constants ===== | ||
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| ==== Misc ==== | ==== Misc ==== | ||
| - | ^Operator^Description^ | + | ^ Operator ^ Description ^ |
| - | |''id++''|**post-increment** of the variable ''id'' (not required by POSIX(r))| | + | | ''id++'' | **post-increment** of the variable ''id'' (not required by POSIX(r)) | |
| - | |''id<nowiki>--</nowiki>''|**post-decrement** of the variable ''id'' (not required by POSIX(r))| | + | | ''id%%--%%'' | **post-decrement** of the variable ''id'' (not required by POSIX(r)) | |
| - | |''++id''|**pre-increment** of the variable ''id'' (not required by POSIX(r))| | + | | ''++id'' | **pre-increment** of the variable ''id'' (not required by POSIX(r)) | |
| - | |''<nowiki>--</nowiki>id''|**pre-decrement** of the variable ''id'' (not required by POSIX(r))| | + | | ''%%--%%id'' | **pre-decrement** of the variable ''id'' (not required by POSIX(r)) | |
| - | |''+''|unary plus| | + | | ''+'' | unary plus | |
| - | |''-''|unary minus| | + | | ''-'' | unary minus | |
| - | |''<EXPR> ? <EXPR> : <EXPR>''|conditional (ternary) operator| | + | | ''<EXPR> ? <EXPR> : <EXPR>'' | conditional (ternary) operator \\ <condition> ? <result-if-true> : <result-if-false> | |
| - | |''<EXPR> , <EXPR>''|expression list| | + | | ''<EXPR> , <EXPR>'' | expression list | |
| - | |''( <EXPR> )''|subexpression (to force precedence)| | + | | ''( <EXPR> )'' | subexpression (to force precedence) | |