Using Loop Control Variable

daniella wrote:

Rhei wrote:thank you po maam sa matyagang pagtuturo sa amin!

hahaha kailangan para pumasa joke. ) love ko kayo kahit di niyo ko love sad

daniella wrote:To make a while loop end correctly, you can declare a loop control variable to manage the number of repetitions a loop performs.
Three separate actions should occur using a loop control variable:

-The loop control variable is initialized before entering the loop.
-The loop control variable’s value is tested, and if the result is true, the loop body is
entered.
-The loop control variable is altered within the body of the loop so that the tested
condition that follows while eventually is false.


Commonly, you can control a loop’s repetitions in one of two ways:

-Use a counter to create a definite, counter-controlled loop.
-Use a sentinel value to create an indefinite loop.

Using a Definite Loop with a Counter

A counter is any numeric variable that counts the number of times an event has occurred.

The illustration below shows a loop that displays Hello four times. The loop is a counted loop, or counter-controlled loop , because theprogram keeps track of the number of loop repetitions by counting them.




A counted while loop that outputs Hello four times

1. The loop control variable, count , is initialized to 0.
2. The while expression compares count to 4.
3. The value of count is less than 4, and so the loop body executes. The loop body shown in Figure consists of two statements that display Hello and then add 1 to count .
4. The next time the condition count < 4 is evaluated, the value of count is 1, which is still less than 4, so the loop body executes again. Hello is displayed a second time and count is incremented to 2, Hello is displayed a third time and count becomes 3, then Hello is displayed a fourth time and count becomes 4.

Using an Indefinite Loop with a Sentinel Value

Consider an interactive program that displays Hello repeatedly as long as the user wants to continue. The loop is indefinite because each time the program executes, the loop might be performed a different number of times.


An indefinite while loop that displays Hello as long as the user wants to continue

In the program in Figure , the loop control variable is shouldContinue . The program executes as follows:

1. The first input shouldContinue statement in the application in Figure is a priming input statement. In this statement, the loop control variable is initialized by the user’s first response.
2. The while expression compares the loop control variable to the sentinel value Y .
3. If the user has entered Y , then Hello is output and the user is asked whether the program should continue. In this step, the value of shouldContinue might change.
4. At any point, if the user enters any value other than Y , the loop ends. In most programming languages, simple comparisons are case sensitive, so any entry other than Y, including y, will end the loop.


Typical executions of the program in Figure 5-4 in two environments.

Rfrancis03 wrote:maam pwede kapa pobang mag bigay ng example sa control variable loop ?

Jericho wrote:

daniella wrote:

Rhei wrote:thank you po maam sa matyagang pagtuturo sa amin!

hahaha kailangan para pumasa joke. ) love ko kayo kahit di niyo ko love sad

Love ka namen maam kahit na ginugulo ka namen sa lesson mo po.

SIGE! hahaha

rsls wrote:

Jericho wrote:

daniella wrote:

Rhei wrote:thank you po maam sa matyagang pagtuturo sa amin!

hahaha kailangan para pumasa joke. ) love ko kayo kahit di niyo ko love sad

Love ka namen maam kahit na ginugulo ka namen sa lesson mo po.

SIGE! hahaha

Ano mas prefer ng ibang programmers, ung gumamit ng array o hindi?

Luwiezzzz wrote:Thank you for creating this, I finally know how to use the loop control properly

Sean wrote:

Emie Laide wrote:Pwede po bang sabay na gamitin ang counter at sentinel?

sa pagkakaintindi ko or opinyon ko lang hindi ata pwede na sabay gamitin kasi yung Counter loop is para maka create ng definite loop while yung isa using sentinel value is para maka create ng indefinite loop . Bale two ways siya on how to control a loop's repetitions .

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airojames wrote:Yes may panibagong topic

Salamat po mam sa panibagong topic

Bermon O. Ferreras Jr wrote:maam what if gumawa kami ng looping na add lang ng add ng 1 .. yung space po ba ng program na yun ay lalaki ?

Bermon O. Ferreras Jr wrote:

Sean wrote:

Emie Laide wrote:Pwede po bang sabay na gamitin ang counter at sentinel?

sa pagkakaintindi ko or opinyon ko lang hindi ata pwede na sabay gamitin kasi yung Counter loop is para maka create ng definite loop while yung isa using sentinel value is para maka create ng indefinite loop . Bale two ways siya on how to control a loop's repetitions .

oo hindi pwede kasi nga yung counter loop ay para makacreate ng definite loop . at yung sentinel para makacreate ng indefinite loop.

Bermon O. Ferreras Jr wrote:maam ang loop po ba ay pwede hindi na huminto ? parang poreber ganun wala ng katapusan ?

Asdfghjkl wrote:

Bermon O. Ferreras Jr wrote:maam ang loop po ba ay pwede hindi na huminto ? parang poreber ganun wala ng katapusan ?

Gamit ka sentinel para indefinite na

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Vann Lewis wrote:

Bermon O. Ferreras Jr wrote:maam what if gumawa kami ng looping na add lang ng add ng 1 .. yung space po ba ng program na yun ay lalaki ?

Hindi siguro pre. Counter naman ang nag-aadd ng nag a add, hindi naman ata kakain ng malaking space.

Emie Laide wrote:

Asdfghjkl wrote:

Bermon O. Ferreras Jr wrote:maam ang loop po ba ay pwede hindi na huminto ? parang poreber ganun wala ng katapusan ?

Gamit ka sentinel para indefinite na

Parang yung sa time pwedeng dmo tapusin kasi tuly tuloy lng nmn ung oras. Depende nlng kung timer ginawa mo [smiley]https://2img.net/i/fa/i/smiles/icon_wink.gif[/smiley]

Asdfghjkl wrote:

Emie Laide wrote:

Asdfghjkl wrote:

Bermon O. Ferreras Jr wrote:maam ang loop po ba ay pwede hindi na huminto ? parang poreber ganun wala ng katapusan ?

Gamit ka sentinel para indefinite na

Parang yung sa time pwedeng dmo tapusin kasi tuly tuloy lng nmn ung oras. Depende nlng kung timer ginawa mo [smiley]https://2img.net/i/fa/i/smiles/icon_wink.gif[/smiley]

Alam ko ang timer reverse yun ehh

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Asdfghjkl wrote:Tanong lang po Kasi po nhng nakaraang quiz diba po analog clock yun naisip ko lang po if timer po yung gagawan nun pano po yung magiging flow kasi po reverse po yun diba?

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rapal wrote:mam pag gumawa po ba ng looping, endless po ba yung pag loloop nya?

Bermon O. Ferreras Jr wrote:

Sean wrote:

Emie Laide wrote:Pwede po bang sabay na gamitin ang counter at sentinel?

sa pagkakaintindi ko or opinyon ko lang hindi ata pwede na sabay gamitin kasi yung Counter loop is para maka create ng definite loop while yung isa using sentinel value is para maka create ng indefinite loop . Bale two ways siya on how to control a loop's repetitions .

oo hindi pwede kasi nga yung counter loop ay para makacreate ng definite loop . at yung sentinel para makacreate ng indefinite loop.