Texas Instruments TI-Nspire, Руководство пользователя

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698 Programming
À
Displays 0, 1, 2, 3, 4, and 5.
Á
Displays 6. When
variable
increments to 6, the loop is not executed.
Note: You can declare the counter variable as local if it does not need to
be saved after the function or program stops.
While...EndWhile loops
A
While...EndWhile
loop repeats a block of commands as long as a
specified condition is true. The syntax of the
While
command is:
While
condition
When While is executed,
condition
is evaluated. If
condition
is true, the
loop is executed; otherwise, control jumps to the command following
EndWhile .
Note: The
While
command does not automatically change the condition.
You must include commands that allow the function or program to exit
the loop.
At the end of the loop (
EndWhile
), control jumps back to the
While
command, where condition is re-evaluated.
To execute the loop the first time, the condition must initially be true.
• Any variables referenced in the condition must be set before the
While
command. (You can build the values into the function or
program, or you can prompt the user to enter the values.)
• The loop must contain commands that change the values in the
condition, eventually causing it to be false. Otherwise, the condition
is always true and the function or program cannot exit the loop
(called an infinite loop).
For example:
For i,0,5,1
Disp i À
EndFor
Disp i
Á
x
|
5
x < 5
While x<5
--------
--------
EndWhile
--------