Exceptions: Difference between revisions
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X.catch SillyError se
print(se.message)</lang>
=={{header|8086 Assembly}}==
{{works with|MS-DOS}}
An exception in assembly language is often little more than just a conditional branch. Most MS-DOS system calls return the carry flag set if an error occured, and the error code will be returned in <code>AX</code>. This lets you write your own exception handler that prints a relevant error message to the screen. You'll need to read the documentation to know what each error code means.
<lang asm>;syscall for creating a new file.
mov dx,offset filename
mov cx,0
mov ah,5Bh
int 21h
;if error occurs, will return carry set and error code in ax
;Error code 03h = path not found
;Error code 04h = Too many open files
;Error code 05h = Access denied
;Error code 50h = File already exists
jnc noError ;continue with program
cmp ax,03h
je PathNotFoundError ;unimplemented exception handler
cmp ax,04h
je TooManyOpenFilesError
cmp ax,05h
je AccessDeniedError
cmp ax,50h
je FileAlreadyExistsError
noError:</lang>
=={{header|Ada}}==
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