goto label . . . label: statement
PARAMETERS
label
The destination label. Label names have the same syntax as variable names
and can duplicate the names of existing variables.
statement
The statement executed after the goto statement. It may be any executable
statement.
The goto 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.
1. The most common use of the goto statement is to branch to an error handler if an abnormal condition is detected.
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
BUGS No checking is done to see if a jump is made into a loop.