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Full Discussion: Arithmetric in while statement
Top Forums Shell Programming and Scripting Arithmetric in while statement Post 302769460 by gary_w on Tuesday 12th of February 2013 10:54:27 AM
Old 02-12-2013
Define the variables as floats and use parens instead of square brackets for a numeric comparison.
Code:
$ cat x
#!/bin/zsh

typeset -F a=1.4
typeset -F b=1.7

printf "START - a: %0.2f, b: %0.2f\n\n" $a $b

while (( $a < 1.5 || $b > 0.7 )); do
  (( a=$a + .1 ))
  (( b=$b - .1 ))
  printf "a: %0.2f, b: %0.2f\n" $a $b
  if (( $a > 1.5 && $b < 0.7 )); then
    break
  fi
done

exit 0
$ ./x
START - a: 1.40, b: 1.70

a: 1.50, b: 1.60
a: 1.60, b: 1.50
a: 1.70, b: 1.40
a: 1.80, b: 1.30
a: 1.90, b: 1.20
a: 2.00, b: 1.10
a: 2.10, b: 1.00
a: 2.20, b: 0.90
a: 2.30, b: 0.80
a: 2.40, b: 0.70
$

Last edited by gary_w; 02-12-2013 at 11:59 AM..
 

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LEARN ABOUT LINUX

start_transaction

START 
TRANSACTION(7)						   SQL Commands 					      START TRANSACTION(7)

NAME

       START TRANSACTION - start a transaction block

SYNOPSIS

       START TRANSACTION [ transaction_mode [, ...] ]

       where transaction_mode is one of:

	   ISOLATION LEVEL { SERIALIZABLE | REPEATABLE READ | READ COMMITTED | READ UNCOMMITTED }
	   READ WRITE | READ ONLY

DESCRIPTION

       This  command begins a new transaction block. If the isolation level or read/write mode is specified, the new transaction has those charac-
       teristics, as if SET TRANSACTION [set_transaction(7)] was executed. This is the same as the BEGIN [begin(7)] command.

PARAMETERS

       Refer to SET TRANSACTION [set_transaction(7)] for information on the meaning of the parameters to this statement.

COMPATIBILITY

       In the standard, it is not necessary to issue START TRANSACTION to start a transaction block: any SQL command implicitly  begins  a  block.
       PostgreSQL's  behavior can be seen as implicitly issuing a COMMIT after each command that does not follow START TRANSACTION (or BEGIN), and
       it is therefore often called ``autocommit''.  Other relational database systems might offer an autocommit feature as a convenience.

       The SQL standard requires commas between successive transaction_modes, but for historical reasons PostgreSQL allows the commas to be  omit-
       ted.

       See also the compatibility section of SET TRANSACTION [set_transaction(7)].

SEE ALSO

       BEGIN [begin(7)], COMMIT [commit(7)], ROLLBACK [rollback(7)], SAVEPOINT [savepoint(7)], SET TRANSACTION [set_transaction(7)]

SQL - Language Statements					    2010-05-14						      START TRANSACTION(7)
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