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|00000000| 5c 73 65 63 74 69 6f 6e | 7b 65 72 72 6f 72 20 2d |\section|{error -|
|00000010| 2d 2d 20 52 61 69 73 65 | 20 61 6e 20 65 72 72 6f |-- Raise| an erro|
|00000020| 72 7d 0d 5c 6c 61 62 65 | 6c 7b 66 6e 3a 65 72 72 |r}.\labe|l{fn:err|
|00000030| 6f 72 7d 0d 5c 69 6e 64 | 65 78 7b 65 72 72 6f 72 |or}.\ind|ex{error|
|00000040| 28 29 7d 0d 5c 69 6e 64 | 65 78 7b 72 61 69 73 65 |()}.\ind|ex{raise|
|00000050| 20 61 6e 20 65 72 72 6f | 72 7d 0d 5c 69 6e 64 65 | an erro|r}.\inde|
|00000060| 78 7b 55 53 45 52 2d 52 | 41 49 53 45 44 2d 45 52 |x{USER-R|AISED-ER|
|00000070| 52 4f 52 7d 0d 5c 69 6e | 64 65 78 7b 65 72 72 6f |ROR}.\in|dex{erro|
|00000080| 72 20 6d 65 73 73 61 67 | 65 73 7d 0d 5c 62 65 67 |r messag|es}.\beg|
|00000090| 69 6e 7b 72 61 69 6c 7d | 0d 45 72 72 6f 72 20 3a |in{rail}|.Error :|
|000000a0| 20 27 65 72 72 6f 72 27 | 20 27 28 27 20 28 20 28 | 'error'| '(' ( (|
|000000b0| 29 20 7c 20 53 74 72 69 | 6e 67 29 20 27 29 27 20 |) | Stri|ng) ')' |
|000000c0| 3b 0d 5c 65 6e 64 7b 72 | 61 69 6c 7d 0d 0d 54 68 |;.\end{r|ail}..Th|
|000000d0| 65 20 5c 76 65 72 62 2b | 65 72 72 6f 72 2b 20 66 |e \verb+|error+ f|
|000000e0| 75 6e 63 74 69 6f 6e 20 | 61 6c 6c 6f 77 73 20 75 |unction |allows u|
|000000f0| 73 65 72 20 64 65 66 69 | 6e 65 64 20 66 75 6e 63 |ser defi|ned func|
|00000100| 74 69 6f 6e 73 20 74 6f | 20 6a 75 6d 70 20 62 61 |tions to| jump ba|
|00000110| 63 6b 20 74 6f 20 74 68 | 65 0d 70 72 6f 6d 70 74 |ck to th|e.prompt|
|00000120| 20 77 68 65 6e 20 74 68 | 65 79 20 64 65 74 65 63 | when th|ey detec|
|00000130| 74 20 61 6e 20 65 72 72 | 6f 72 20 68 61 73 20 6f |t an err|or has o|
|00000140| 63 63 75 72 72 65 64 2e | 20 54 68 65 20 6e 61 74 |ccurred.| The nat|
|00000150| 75 72 65 20 6f 66 20 74 | 68 65 0d 65 72 72 6f 72 |ure of t|he.error|
|00000160| 20 6d 65 73 73 61 67 65 | 20 64 69 73 70 6c 61 79 | message| display|
|00000170| 65 64 20 69 73 20 75 70 | 20 74 6f 20 74 68 65 20 |ed is up| to the |
|00000180| 75 73 65 72 2e 20 20 49 | 66 20 6e 6f 20 61 72 67 |user.  I|f no arg|
|00000190| 75 6d 65 6e 74 20 69 73 | 0d 73 75 70 70 6c 69 65 |ument is|.supplie|
|000001a0| 64 2c 20 5c 76 65 72 62 | 2b 65 72 72 6f 72 2b 20 |d, \verb|+error+ |
|000001b0| 77 69 6c 6c 20 70 72 69 | 6e 74 20 74 68 65 20 64 |will pri|nt the d|
|000001c0| 65 66 61 75 6c 74 20 6d | 65 73 73 61 67 65 2c 20 |efault m|essage, |
|000001d0| 77 68 69 63 68 20 69 73 | 0d 5c 76 65 72 62 2b 55 |which is|.\verb+U|
|000001e0| 53 45 52 2d 52 41 49 53 | 45 44 2d 45 52 52 4f 52 |SER-RAIS|ED-ERROR|
|000001f0| 2b 2e 20 49 66 20 61 20 | 73 74 72 69 6e 67 20 61 |+. If a |string a|
|00000200| 72 67 75 6d 65 6e 74 73 | 20 69 73 20 73 75 70 70 |rguments| is supp|
|00000210| 6c 69 65 64 2c 20 74 68 | 65 6e 20 74 68 61 74 0d |lied, th|en that.|
|00000220| 73 74 72 69 6e 67 20 69 | 73 20 64 69 73 70 6c 61 |string i|s displa|
|00000230| 79 65 64 2e 0d 0d 7b 5c | 65 6d 20 4a 75 6d 70 69 |yed...{\|em Jumpi|
|00000240| 6e 67 20 62 61 63 6b 20 | 74 6f 20 74 68 65 20 70 |ng back |to the p|
|00000250| 72 6f 6d 70 74 7d 20 6d | 65 61 6e 73 20 65 78 65 |rompt} m|eans exe|
|00000260| 63 75 74 69 6f 6e 20 6f | 66 20 74 68 65 20 63 75 |cution o|f the cu|
|00000270| 72 72 65 6e 74 20 6c 6f | 6f 70 0d 6f 72 20 66 75 |rrent lo|op.or fu|
|00000280| 6e 63 74 69 6f 6e 20 69 | 73 20 74 65 72 6d 69 6e |nction i|s termin|
|00000290| 61 74 65 64 20 69 6d 6d | 65 64 69 61 74 65 6c 79 |ated imm|ediately|
|000002a0| 2c 20 61 6e 64 20 74 68 | 65 20 63 6f 6e 74 72 6f |, and th|e contro|
|000002b0| 6c 20 69 73 20 72 65 74 | 75 72 6e 65 64 20 74 6f |l is ret|urned to|
|000002c0| 0d 74 68 65 20 5c 52 4c | 61 42 5c 20 63 6f 6d 6d |.the \RL|aB\ comm|
|000002d0| 61 6e 64 20 6c 69 6e 65 | 2e 0d 0d 0d 5c 70 61 72 |and line|....\par|
|000002e0| 61 67 72 61 70 68 7b 45 | 78 61 6d 70 6c 65 7d 0d |agraph{E|xample}.|
|000002f0| 5c 69 6e 64 65 78 7b 65 | 78 61 6d 70 6c 65 20 6f |\index{e|xample o|
|00000300| 66 20 65 72 72 6f 72 28 | 29 7d 0d 5c 69 6e 64 65 |f error(|)}.\inde|
|00000310| 78 7b 65 72 72 6f 72 28 | 29 21 65 78 61 6d 70 6c |x{error(|)!exampl|
|00000320| 65 7d 0d 5c 62 65 67 69 | 6e 7b 76 65 72 62 61 74 |e}.\begi|n{verbat|
|00000330| 69 6d 7d 0d 3e 20 65 72 | 72 6f 72 28 29 0d 72 6c |im}.> er|ror().rl|
|00000340| 61 62 3a 20 55 53 45 52 | 2d 52 41 49 53 45 44 2d |ab: USER|-RAISED-|
|00000350| 45 52 52 4f 52 0d 3e 20 | 65 72 72 6f 72 28 22 54 |ERROR.> |error("T|
|00000360| 68 65 20 61 72 67 75 6d | 65 6e 74 20 77 61 73 20 |he argum|ent was |
|00000370| 6f 66 20 74 68 65 20 77 | 72 6f 6e 67 20 66 6f 72 |of the w|rong for|
|00000380| 6d 22 29 0d 72 6c 61 62 | 3a 20 54 68 65 20 61 72 |m").rlab|: The ar|
|00000390| 67 75 6d 65 6e 74 20 77 | 61 73 20 6f 66 20 74 68 |gument w|as of th|
|000003a0| 65 20 77 72 6f 6e 67 20 | 66 6f 72 6d 0d 3e 20 65 |e wrong |form.> e|
|000003b0| 72 72 6f 72 28 22 48 61 | 76 65 20 79 6f 75 20 67 |rror("Ha|ve you g|
|000003c0| 6f 74 20 61 6e 79 20 69 | 64 65 61 20 77 68 61 74 |ot any i|dea what|
|000003d0| 20 79 6f 75 20 61 72 65 | 20 64 6f 69 6e 67 3f 22 | you are| doing?"|
|000003e0| 29 0d 72 6c 61 62 3a 20 | 48 61 76 65 20 79 6f 75 |).rlab: |Have you|
|000003f0| 20 67 6f 74 20 61 6e 79 | 20 69 64 65 61 20 77 68 | got any| idea wh|
|00000400| 61 74 20 79 6f 75 20 61 | 72 65 20 64 6f 69 6e 67 |at you a|re doing|
|00000410| 3f 0d 5c 65 6e 64 7b 76 | 65 72 62 61 74 69 6d 7d |?.\end{v|erbatim}|
|00000420| 0d 0d 53 65 65 20 61 6c | 73 6f 3a 20 50 61 67 65 |..See al|so: Page|
|00000430| 7e 5c 70 61 67 65 72 65 | 66 7b 66 6e 3a 70 72 69 |~\pagere|f{fn:pri|
|00000440| 6e 74 66 7d 20 5c 76 65 | 72 62 2b 70 72 69 6e 74 |ntf} \ve|rb+print|
|00000450| 66 28 29 2b 2e 0d 0d 5c | 6e 65 77 70 61 67 65 0d |f()+...\|newpage.|
|00000460| 0d 0d 0d 0d 0d 0d 0d    |                         |....... |        |
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