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Need help on ksh

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# 1  
Old 10-25-2009
Need help on ksh
1. Script using bash
Code:
#!/bin/bash
a=4294967296
(( b=$a / 2 ))
echo "$a"
echo "$b"

*** output ***
Code:
4294967296
2147483648

2. Script using ksh
Code:
#!/bin/ksh
a=4294967296
(( b=$a / 2 ))
echo "$a"
echo "$b"

*** output ***
Code:
4294967296
0

I am using cygwin to run above scripts. It seems to be working on bash but not on ksh.

Any idea why it is not working on ksh?
Last edited by Franklin52; 10-26-2009 at 05:41 AM.. Reason: Please use code tags!
# 2  
Old 10-25-2009
Your version of ksh on Cygwin is probably pdksh (Public domain ksh.) Check $KSH_VERSION to be certain. pdksh only supports integer arithmetic and uses 32-bit integers for that purpose on Cygwin. Therefore it is limited in the size of the integers which it can handle. As a test, set a to 4000 and see if the result is 2000.
# 3  
Old 10-26-2009
Thanks fpmurphy for the clarification.
# 4  
Old 10-26-2009
The limit in ksh for integer arithmetic is exactly:
((1024 x 1024 x 1024 x 2) - 1)

Code:
expr 2147483647 + 0
2147483647

expr 2147483647 + 1
-2147483648

This limit can be circumvented by using "bc".
Code:
echo "2147483647 + 1"|bc
2147483648

Once the numbers are above 2147483647 in ksh, store them in character variables because an integer variable will overflow.
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