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OrbWorks Community Forum • View topic - Is it a bug ?

Is it a bug ?

Discuss PocketC for Palm OS (including Desktop Edition)

Postby rongviet on Tue Aug 14, 2007 1:29 am

Look like the bitwise shift right operator returns a wrong value.

main(){
int n=-75968486;
n = n>>5;
puts("n="+n);
}

The program output is -2374016. Should it be 131843712 ?
Could someone verify the answer. I am running with Palm PocketC 7.1.3.

Thanks.
DP
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Postby dewey on Tue Aug 14, 2007 3:02 am

Since an int is a signed value (PocketC doesn't support unsigned types), a right shift will always use sign extension. Thus, the output will always be negative if the value starts out negative.
dewey
Site Admin
 
Posts: 749
Joined: Sun Oct 21, 2007 5:12 am

Postby rongviet on Tue Aug 14, 2007 10:03 am

Thank you for response quickly. You are right, shift right a negative number should be a negative number. To get the answer as in the unsigned number, I need to AND with 0x07FFFFFF.

e.g., n = n>>5 & 0x07ffffff;

Thanks again.
DP
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Joined: Wed Jul 07, 2004 12:16 am
Location: USA


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