close
print
type
thing
pause
wait
readchar
(rc)
readword
(rw)
readlist
(rl)
cleartext
(ct)
pots
erase
(er)
eraseall
(erall)
6. Flow control Commands
if <condition> then [commands]
if <condition> then [commands1] If <condition> is TRUE then the commands
else [commands2] in [commands1] are executed. Otherwise the
label
<label>
go
<label>
n
close a device.
n
print its inputs to the output stream.
n
print its inputs on the screen, and the prompt appears
after the last character printed.
n
output the value associated with the variable named
in the input.
temporarily halt the execution of a procedure.
n
insert a pause before the next instruction is run. The
length of the pause is the input to WAIT times 1/30
of a second.
output the first character from the input stream. If no
character is waiting to be read, READCHAR waits
for input from the keyboard.
output in the form of a word from the input stream.
If no line is waiting to be read, READWORD waits
for input from the keyboard.
output in the form of a list from the input stream. If
no line is waiting to be read, READLIST waits for
input from the keyboard.
clear output window content.
print the titles of all user-defined procedures. POTS
stands for "Print Out Titles".
n
remove the definition of its input from the workspace.
The input to ERASE must be a procedure name.
remove all procedures and variables from the
workspace.
The <condition> must result in a value of either TRUE
or FALSE. If the <condition> is TRUE then the commands
in [commands] are executed.
commands in [commands2] are executed.
This command marks a location in the program so
execution of LOGO commands can be started or resumed
at this point with a GO command.
<label> must be a label defined elsewhere in the program
with a LABEL command. The GO command causes
command execution to jump to the location of the LABEL
command with the corresponding <label>.
30
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