W0520068 Message(CC-RL)
Last Updated:04/17/2017
Question:
I am using the CC-RL compiler for RL78 devices. The message W0520068 appears when I write the statement to shift the constant 1 shown below.
W0520068: Integer conversion resulted in a change of sign.
Why is this judged to change the sign?
(Statement) a&(1<<b)
W0520068: Integer conversion resulted in a change of sign.
Why is this judged to change the sign?
(Statement) a&(1<<b)
Answer:
The constant is of the int type, so the highest-order bit represents the sign.
The message is shown since shifting the 1 of the int type to the left affects the value of the highest-order bit.
The message will not appear if the 1 in the statement is clearly specified as having no sign by using the suffix U as shown below.
(Example)
a & (1U << b)
The message is shown since shifting the 1 of the int type to the left affects the value of the highest-order bit.
The message will not appear if the 1 in the statement is clearly specified as having no sign by using the suffix U as shown below.
(Example)
a & (1U << b)
Suitable Products
| e² studio |
| CS+ (formerly CubeSuite+) |
| C Compiler Package for RL78 Family |