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  • Committer: Suren A. Chilingaryan
  • Date: 2009-04-09 03:21:08 UTC
  • Revision ID: csa@dside.dyndns.org-20090409032108-w4edamdh4adrgdu3
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Development/languages/awk/awk.expr
 
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############################# Expresions ######################################
 
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f = 5E+01                       # & etc
 
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a = 2; b = 3; print (a b) + 4;  # Prints 27 (23+4)
 
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a + b; a - b; - a ; + a ;       # Last for converting string to number
 
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a * b; a / b; a % b             # ...
 
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a ** b; a ^ b                   # "a" raised to the "b" power
 
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a = b = c = 0;                  # You can do so
 
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a += b; a++;                    # And so on
 
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!=, ==, >, <, <=, >=            # String or Numeric Comparisons ( if 1 argument
 
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                                # string used string comparision ( if unknown
 
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                                # thinking that numeric ) )
 
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                                # Numerics converted with help of "CONVFMT",
 
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                                # to be compared with strings 
 
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||, &&, !                       # ...
 
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b in a                          # True if Array "a" have subscript "b"
 
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                                # Example: 
 
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                                #       foo[rand()] += 5 ;
 
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                                #       for (x in foo ) print x, foo[x]
 
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a[1, "a"]                       # Arrays, and so on ( Numeric values converted
 
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                                # with "CONVFMT", BE WARE!)
 
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                                # WARNING! a[1, "a"] ~ a[1"SUBSEP"a]
 
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                                # "(b, c) in a" - works to, for example:
 
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                                #       for ( x in foo ) {
 
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                                #               split(x,separate,SUBSEP) ... }
 
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delete a[1]                     # Delete element of array
 
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                                #       Main Idea will not apear in "in"
 
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delete a                        # Deletes all elements of array
 
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a b                             # Concatenation
 
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expr ? if_true... : if_false... # ...
 
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############################# String Conversions ##############################
 
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"2.5"   --> 2.5         "1e3"   --> 1000        "25fix" --> 25
 
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"fix"   --> 0   ( and at all if begins not from number then --> 0 )
 
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And at all in info files string/numeric selection is very misty...
 
 
b'\\ No newline at end of file'