11-21-2005
How to perform calculations using numbers greater than 2150000000.
Could someone tell me how to perform calculations using numbers greater than 2150000000 in Korn Shell? When I tried to do it it gave me the wrong answer.
e.g. I have a ksh file with the contents below:
---------------------------------
#!/bin/ksh
SUM=`expr 2150000000 + 2`
PRODUCT=`expr 2150000000 "*" 2`
QUOTIENT=`expr 2150000000 / 2`
echo The sum is $SUM
echo The product is $PRODUCT
echo The quotient is $QUOTIENT
---------------------------------
It should give 2150000002 for SUM, 4300000000 for PRODUCT and 1075000000 for QUOTIENT but it outputs below:
The sum is -2144967294
The product is 5032704
The quotient is -1072483648
Last edited by stevefox; 11-21-2005 at 08:56 PM..
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EXPR(1) FSF EXPR(1)
NAME
expr - evaluate expressions
SYNOPSIS
expr EXPRESSION
expr OPTION
DESCRIPTION
--help display this help and exit
--version
output version information and exit
Print the value of EXPRESSION to standard output. A blank line below separates increasing precedence groups. EXPRESSION may be:
ARG1 | ARG2
ARG1 if it is neither null nor 0, otherwise ARG2
ARG1 & ARG2
ARG1 if neither argument is null or 0, otherwise 0
ARG1 < ARG2
ARG1 is less than ARG2
ARG1 <= ARG2
ARG1 is less than or equal to ARG2
ARG1 = ARG2
ARG1 is equal to ARG2
ARG1 != ARG2
ARG1 is unequal to ARG2
ARG1 >= ARG2
ARG1 is greater than or equal to ARG2
ARG1 > ARG2
ARG1 is greater than ARG2
ARG1 + ARG2
arithmetic sum of ARG1 and ARG2
ARG1 - ARG2
arithmetic difference of ARG1 and ARG2
ARG1 * ARG2
arithmetic product of ARG1 and ARG2
ARG1 / ARG2
arithmetic quotient of ARG1 divided by ARG2
ARG1 % ARG2
arithmetic remainder of ARG1 divided by ARG2
STRING : REGEXP
anchored pattern match of REGEXP in STRING
match STRING REGEXP
same as STRING : REGEXP
substr STRING POS LENGTH
substring of STRING, POS counted from 1
index STRING CHARS
index in STRING where any CHARS is found, or 0
length STRING
length of STRING
+ TOKEN
interpret TOKEN as a string, even if it is a
keyword like `match' or an operator like `/'
( EXPRESSION )
value of EXPRESSION
Beware that many operators need to be escaped or quoted for shells. Comparisons are arithmetic if both ARGs are numbers, else lexicograph-
ical. Pattern matches return the string matched between ( and ) or null; if ( and ) are not used, they return the number of characters
matched or 0.
AUTHOR
Written by Mike Parker.
REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>.
COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO
The full documentation for expr is maintained as a Texinfo manual. If the info and expr programs are properly installed at your site, the
command
info expr
should give you access to the complete manual.
GNU coreutils 4.5.3 February 2003 EXPR(1)