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Diffstat (limited to 'pkg/language/doc/goto.hlp')
| -rw-r--r-- | pkg/language/doc/goto.hlp | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/pkg/language/doc/goto.hlp b/pkg/language/doc/goto.hlp new file mode 100644 index 00000000..ccd745ce --- /dev/null +++ b/pkg/language/doc/goto.hlp @@ -0,0 +1,57 @@ +.help goto Feb86 language +.ih +NAME +goto -- branch to a label +.ih +USAGE +.nf +goto label + . + . + . +label: statement + +.fi +.ih +PARAMETERS +.ls label +The destination label. Label names have the same syntax as variable names +and can duplicate the names of existing variables. +.le +.ls statement +The statement executed after the goto statement. It may be any executable +statement. +.le +.ih +DESCRIPTION +The \fIgoto\fR statement interrupts the normal flow of program execution by +transferring control to the statement following the label. It may also be +used to exit from nested loops where the break statement is not adequate. +.ih +EXAMPLES +1. The most common use of the \fIgoto\fR statement is to branch to an error +handler if an abnormal condition is detected. + +.nf +begin + for (i=1; i <= 100; i += 1) + for (j=1; j <= 100; j += 1) + for (k=1; k <= 100; k += 1) + if (pixel[i,j,k] < 0) + goto err + else + total += pixel[i,j,k] + + print ("total = ", total) + return +err: + print ("Invalid pixel value at ",i,j,k) +end +.fi +.ih +BUGS +No checking is done to see if a jump is made into a loop. +.ih +SEE ALSO +break, next +.endhelp |