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1. Intro to Iteration

2. Introduction to iteration So far in computer science, you have learned how to write blocks of code that perform certain tasks What if you wanted to perform the same task over and over again? With the knowledge we have right now, that would be copying and pasting the same lines of code, but that is NOT the most effective method

3. What if we can perform a task ANY number of times while keeping the number of lines of code almost the same?

4. For loop In this for loop, we create a variable called i in the beginning and set it equal to . Inside the loop, we print what i is currently equal to. Then we increase i by 1 This loop keeps repeating until i becomes 15 . When i becomes 15, the condition at the top of the loop is false, so the loop stops running (int i=0; i<15; i++) {System.out.println(i);}

5. Introducing iteration Iteration is the process of repeating a block of code over and over again until a specific result is achieved. Otherwise known as a loop We will be going over 2 types of iterations: a for loop a while loop

6. What is a for loop? A for loop is a loop you put outside your code block that is pre-set to run a certain amount of times and stops after that number has been reached An example looks like this (written in Java): (int i=0; i<15; i++) {System.out.println(i);}

7. For loops -> fun! Now let’s get into the second type of iteration: the WHILE loop

8. What is a while loop? A while loop has a similar definition to a for loop, except it is not pre-set to run a certain amount of times You just specify a condition and your loop just keeps running until that condition becomes false

9. A while loop The same example we did with the for loop- we can actually write it as a while loop! Here’s how it goes: int i=0 while (i<15) {print i;i++;}

10. Key differences Here are the key differences between for and while loops. We actually had to declare the variable for the condition outside the loop We also must add a line inside the loop to increment i . The for loop would automatically do it for us , but since it’s a while loop, we have to add i++ , otherwise the while loop will NEVER STOP running , and we’ll run into an infinite loop int i=0 while (i<15) {print i;i++;}

11. For loops immediately stop after a certain amount of time, but you have to MAKE SURE that your while loop finishes That’s an intro to iteration!

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