Pravin1389: Created page with '{| border=1 !Time !Narration |- |0:00 |okay i have decided to do each looping tutorial in a different video because i don't want to confuse anyone. |- |0:07 |i want to keep it si…'

2013-04-20T20:24:55Z

Created page with '{| border=1 !Time !Narration |- |0:00 |okay i have decided to do each looping tutorial in a different video because i don't want to confuse anyone. |- |0:07 |i want to keep it si…'

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{| border=1
!Time
!Narration
|-
|0:00
|okay i have decided to do each looping tutorial in a different video because i don't want to confuse anyone.
|-
|0:07
|i want to keep it simple and also for a reference perhaps if you need to come back and refer to how a particular loop is initialized.how it works.then this i find it much easier to have a separate video
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|0:22
|okay so what we are going to do is we gonna use a while loop
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|0:25
|now a while loop checks for condition at the start at the loop and executes the code depending on whether this condition is true or not
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|0:35
|so for example what I'm gonna do is I'm gonna start my 'while loop' and I'm gonna say this my condition and this my block
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|0:44
|I'll represent it well my block is in between some curly brackets
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|0:52
|okay my condition here.now the thing with this is ,in the last,in the 'if statement' example i used 1=1.
|-
|1:02
|now if I was to say 'test' or 'loop' here.
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|1:08
|okay there is loop here and then a brake,now what this would do is,as long as 1=1 it would create a loop
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|1:14
|now if i do wrong my brown.so I man you can try these if you want.
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|1:19
|it would probably crash your browser because loop would be repeated as long as 1=1 and which i am afraid is forever.1 will always equal 1
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|1:29
|so therefore loop will always be repeated therefore your browser will be crashed
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|1:33
|so what I can say is I can say while a variable let say 'num' is smaller or equal to 10 and what i can do is under my echo i can say 'num ++'
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|1:57
|now '++' is a arthematical operator.i dint cover my arthematical operator tutorial and what is basically does is it increases 1,it is same as writing 'num =num +1'
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|2:16
|so its taking this and its saying that it is equal to the value of it currently at 1 more.
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|2:22
|okay so this again is a arthematical operator. so basically in our program this is gonna happen
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|2:29
|we are gonna say is 'num' smaller than or equal to2:46 '10'.if so echo loop and then say add 1 on to the valuable
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|2:46
|but what we should really do is create 'num = to 1' at the moment.so loop once at 1 this will then equal 2 then 3 then 4 all the way up to 10 then in which case it will stop
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|3:02
|and then the rest of the code below this will continue
|-
|3:06
|so we said this 1 and see what will we get. okay we got loop 1,2,3,4,5,6,7,8,10 times
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|3:20
|okay now to make it more fun I'm going to say loop 1 and I'm gonna concatenate 'num' on the end of that
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|3:29
|In fact let's be sensible about it and say 'num' inside that it will make it easier to read
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|3:37
|okay so I'm gonna say loop 1 and add 1 and then I'll say loop 2 and I'll add another one that's loop 3 add another one bla-bla-bla
|-
|3:49
|lets open this up refresh it there you go, you got loop 1,2,3 all the way up to 10 like you can see
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|3:57
|so you can change this value here to 100 if you like.refresh that.you can see it has gone to hundred.now the bigger you make it the longer it will take
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|4:09
|let's over 6000.let's refresh that.it's gonna take a while and there you go up to six thousand.so it's very efficient in this way
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|4:20
|if you leastwise if you can try combining this with an 'array' to create a program that echoes out of the alphabet inside the 'array'
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|4:33
|you can use loops to echo out every single value of an array
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|4:36
|just give it a go if you fancy it it would probably be in one my tutorial not in the basics section and I probably would do something like that
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|4:45
|however,this is the basics structure. what I also recommend you to do is create a variable here called 'max' and have your maximum value here
|-
|4:54
|he will do exactly the samething it's just a lot more easy to read and you can declare all this thing up here and this would be a reference to it
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|5:02
|just in case you have more than 1 loop. I prefer it for readability and flexibility for my program.okay so that a while loop and I'll just overview it checks the condition of the start
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|5:15
|if that condition is true. it would execute this block of code and you can do things like 'echo alpha'
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|5:21
|your variable is been implemented.make sure that you do implement your variable otherwise it will loop for infinity.
|-
|5:31
|okay thanks for watching
|-

PHP-and-MySQL/C2/Loops-While-Statement/English - Revision history

Pravin1389: Created page with '{| border=1 !Time !Narration |- |0:00 |okay i have decided to do each looping tutorial in a different video because i don't want to confuse anyone. |- |0:07 |i want to keep it si…'