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Renesas Technology, Tools FAQs
Last Updated: September 20, 2001
Document Number: 01090501_e
Q.
I get the following warning when I assign the minimum value [-2147483648] as the long-type variable, even though this value is
stated in the manual. What is the problem?
"constant out of range due to unportable conversion"
A.
The value stated in the manual, [-2147483648] is correct for the value for the long-type variable. However, according ANSI-C
language specifications, the [2147483648] part is an unsigned long-type variable, and when this is signed, it goes out of the
unsigned long-type range and a special conversion takes place. The compiler is issuing the warning concerning this point.
Normally, when stating the minimum value as the long-type variable, you should use the macro "LONG_MIN", which is defined in
the ANSI-C standard header file [limits.h].
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