0.9b (c) 1995 Peter Childs
If you want to repeat several instructions in a procedure, you can use a loop. Loops often are used in programming because they condense many lines of instructions into a group that can be run more than once. Loops make your procedures more concise, and with a loop, you can continue asking a user for input until the correct answer is given.
With loops, you can keep adding or subtracting numbers until you want to stop. You can define how many times you want a procedure to handle an operation. You will see how to use simple loops to repeat instructions in a procedure.
The two types of loops you may find useful are repetitive loops and conditional loops. Loops begin with a DO instruction and end with the END instruction. The following is a list of topics in this section:
DO num loop Repeats the loop a fixed number of times.
DO i=1 to 10 loop Numbers each pass through the loop. Sets a starting and ending value for the variable.
DO WHILE Tests for true or false at the top of the loop. Repeats the loop if true. If false, continues processing after END.
Do UNTIL Tests for true or false at the bottom of the loop. Repeats the loop if false. If true, continues processing after END.
LEAVE Causes the interpreter to exit a loop.
DO FOREVER Repeats instructions until the user says to quit.
Getting out of loops Requires that you press the Ctrl+Break keys.
Parsing words Assigns a different variable to each word in a group.
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