ARMCC: WARING #61-D: INTEGER OPERATION RESULT IS OUT OF RANGE

Information in this article applies to:

• RealView C Compiler All Versions

QUESTION

I have written the following code:

unsigned int i;
i = (u32)(3<<30);

However this generates a warning:

warning:  #61-D: integer operation result is out of range

Can I avoid this warning somehow?

ANSWER

The compiler overflow warning is correct, because the expression 3<<30 represents a signed int. To avoid the warning, explicitly define the constant 3 as an unsigned value using the U postfix. For example:

unsigned int i;
i = (u32)(3U<<30);

MORE INFORMATION

• You may wish to refer to a good General Programming Book like The C Programming Language by Kernigan & Ritchie.

SEE ALSO

• C: C STANDARDS

Last Reviewed: Wednesday, November 15, 2006