How to manipulate integer overflow in hexadecimal.(Urgent)

raghavendrap · #1 November 1st, 2008, 07:12 AM

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$tmp  = 0xc0211082;

 $tmp1 = 0xc0000082;

Hello friends,
I got doubt when i am converting negative hexadecimal to a decimal number.Please look at mentioned example below.
In the below example my question is when i am converting an hexadecimal to an decimal number i am getting integer overflow in hexadecimal? But the actual values of $tmp & $tmp1 in decimal is signed numbers i.e -1071574910,-1073741694 respectively.
How to manipulate this type of situations?

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 $tmp  = 0xc0211082;

 $tmp1 = 0xc0000082;
 
 $tmp2_dec = hex($tmp);

 $tmp3_dec = hex($tmp1);
 
 printf("Decimal Value tmp is %d \n",$tmp);

 printf("Decimal Value tmp1 is %d \n",$tmp1);

 printf("Decimal Value tmp2 is %d \n",$tmp2_dec);

 printf("Decimal Value tmp3 is %d \n",$tmp3_dec);
 
if($tmp2_dec >0 && $tmp3_dec >0){

print("Temporary values are greater than Zero \n");

}else {

print("Temporary values are less than zero \n");

}

Thanks
Raghavendra

KevinADC · #2 November 1st, 2008, 06:23 PM

As the hex() functions manpage explains:

To convert strings that might start with either 0, 0x, or 0b, see oct .

http://perldoc.perl.org/functions/oct.html

raghavendrap · #3 November 3rd, 2008, 05:12 AM

Hello,
Can you please be clear about what your are trying to explain me.

Thanks
Raghavendra

KevinADC · #4 November 3rd, 2008, 06:30 PM

please read the links next time:

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 $tmp2_dec = oct('0xc0211082');

$tmp3_dec = oct('0xc0000082');
 
print "$tmp2_dec   $tmp3_dec\n";
 
$t2 = sprintf "%d", $tmp2_dec;

$t3 = sprintf "%d", $tmp3_dec;
 
print "$t2 $t3\n";
 
printf ("Decimal Value tmp is %d \n",$tmp2_dec);

printf("Decimal Value tmp1 is %d \n",$tmp3_dec);
 
if($t2 > 0 && $t3 > 0){

   print("Temporary values $t2 and $t3 are greater than Zero \n");

}else {

   print("Temporary values $t2 and $t3 are less than zero \n");

}

raghavendrap · #5 November 4th, 2008, 04:59 AM

Thank you very much kevin
Can u please provide me some useful links of perl, i need to write automation script for assembly instructions & need to generate .asm file..

Thanks
Raghvendra

KevinADC · #6 November 4th, 2008, 06:03 AM

http://bytes.com/forum/thread790489.html
http://www.perlmonks.com/index.pl?node=Tutorials

How to manipulate integer overflow in hexadecimal.(Urgent)

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