What is the difference between if and while loop

I tried what you said Delta G and got different results. Now it all makes sense. I ran across this post while trying to teach myself Arduino and I just wanted to say thanks for this concise comparison of these three functions!

I have been reading a lot of forum posts and tutorials but hadn't seen these cases so clearly laid out like this. THIS makes the connection for me. It is a statement. You'll only confuse yourself if you think of it as a loop. You are correct, I am now confused. I just used the following lines of code to successfully perform a counted loop -.

That block will loop the "turn LED on and off" lines of code for as many times as I enter in the "if" condition. Not being confrontational here, I'm just trying to understand why that isn't considered a "loop". The for statement is the loop. It is doing the looping. Within each iteration of that looping, the if statement only executes once. So the if is not a loop. The if is IN a loop. Normally you put the test in the for loop. The way you have it written once it stops flashing the LED that for loop of your continues to run doing nothing until it wraps around to 0.

Second, a for statement has three parts: initializer, test, increment. Finally, AFTER each iteration of the loop, the increment expression which you did not provide is evaluated. So, what is the above code doing?

Thanks Ray! The for-each form of for loop automates the iteration of the loop from starting to end accessing the values in sequential order. There are various types of collection used with for loop. Here, the loop iterates until all the elements of the array are examined. However, the change in the iteration variable does not affect the array, as it is only a read-only variable. The while loop initially checks the condition and then executes the statements till the condition in while loop turns out to be true.

The condition in while loop can be any boolean expression. When an expression returns any non-zero value, then the condition is true, and if the expression returns a zero value, the condition becomes false.

If the condition becomes true, then loop iterates itself, and if the condition becomes false, then the control passes to the next line of the code immediately followed by the loop.

The statements or the body loop can either be an empty statement or a single statement or a block of statements. In the example below the code will print from 1 to This continues till the condition is true, as soon as the condition becomes false, the loop is terminated.

May it be a for loop or a while loop, if there is only one statement in the body of the loop, the curly braces are not required in that condition. The for loop and while loop both are iteration statement, but both have their distinct feature.

The for loop do have all its declaration initialization, condition, iteration at the top of the body of the loop. Adversely, in while loop only initialization and condition is at the top of the body of loop and iteration may be written anywhere in the body of the loop. Your email address will not be published. Key Differences Between for and while loop In for loop, initialization, condition checking, and increment or decrement of iteration variable is done explicitly in the syntax of a loop only.

Start your free trial today. The situation is to decrement as long as the dispenser is not empty. I don't understand why it does not work when I use "while" instead of "if" for: if! I would appreciate any help and clarification. Hey again Jian, the main different between and if statement, is that it only checks the object once. So if it sees that the pezDispenser is not empty by your code it will only decremented once.

The benefits of a while loop is that it will continue to check the conditional and continue to do the body of the statement until the while is no longer true, in this case: it will continue to decremented the PezDispenser until it is is empty.

Let's say we had 5 pez in the dispenser, you would need to run your if statement 5 times to make it decremented as much as a single while loop can, though this can be done it's easier to just use the while loop, who knows when you will be dealing with a value in the 's if not a , In short, the while loop continues to check the the logic in your statement after the method is complete, where as an if method only performs the operation once.

But what allowed for the dispenser to perform 12 continuous decrements when Craig used "if" in the Incrementing and Decrementing video?