Sequencing selection and iteration

There are many, many programming languages available that allow us to program computers to solve all kinds of problems. There are scripting languages, systems languages, web programming languages, dynamic languages, object-oriented languages, functional languages, and the list goes on and on. But did you know that all programming languages have 3 elements in common?

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Three very simple elements that give us the power to implement solutions to extremely complex problems. These 3 elements are:. Sure, many programming languages have many other complex features. When you are ready to run the program, simply click on the green Run button at the top of the screen. If you see any errors, then double check that you entered the code exactly as shown and try it again.

Once the program runs, you will be able to enter data and see output at the bottom of the screen. The order must be very specific — remember the computer is not very smart — it simply follows our instructions.

sequencing selection and iteration

Just a fancy word that describes a set of operations that solves a specific problem. You can think of this very much like a cooking recipe. If you follow the recipe exactly, you will end up with the produce of that recipe. SequenceSelectionand Iteration are the basic elements that we use to tell the computer what to do. When we put them together we can create programs that are very complex such as operating systems, game engines, compilers, anything!

Most programming languages simply execute instructions one after another as they are read — much like reading a recipe or a book. The code on lines 7, 8, and 9 are what we are interested in. Run this program several times and enter different ages. See the selection, we are selecting which operations to execute depending on what the value of age is.

Pretty simple and useful too! Notice that on line 10 we added an if statement. But, suppose there are 3 voters and we would like to ask each of them what their age is. We could copy and paste the code 3 times, right?

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But we now added a new operation on line 7 that tells the program to count from 1 to 3 and execute everything from lines that many times. Pretty cool! Of course, there is much more to programming. As our problems grow larger and more complex, we need other elements to help us deal with the complexity. Some of these elements are classes, methods, functions, threads, and many others. Ready to learn more? Specifically, can JavaScript collect and handle data from a user in a mobile environment.

Your email address will not be published. So, what are these 3 elements all about? For example, do this first, then do this, then do that, and so forth. Selection — selecting which path of an algorithm to execute depending on some criteria. For example, if you passed a class in school, then we execute the operations that clap and cheer and play a song.

Read that again! Any algorithm! Pretty boring right? Yes, but the computer is doing exactly what we are telling it to do.When you write lines of code, there are three ways you can control the order these lines will be executed by the computer:.

Sequencing, Selection & Iteration

Take the quiz open full screen :. Get ready for the new computing curriculum. Find new computing challenges to boost your programming skills or spice up your teaching of computer science. When you write lines of code, there are three ways you can control the order these lines will be executed by the computer: Sequencing: This means that the computer will run your code in order, one line at a time from the top to the bottom of your program.

It will start at line 1, then execute line 2 then line 3 and so on till it reaches the last line of your program. Selection: Sometimes you only want some lines of code to be run only if a condition is met, otherwise you want the computer to ignore these lines and jump over them. This is achieved using IF statements. If a condition is met then lines 4, 5, 6 are executed otherwise the computer jumps to line 7 without even looking at line 4,5 and 6. Iteration: Sometimes you want the computer to execute the same lines of code several times.

This is done using a loop. There are three types of loops: For loops, while loops and repeat until loops. Other challenges you may enjoy My daily routine Year Yes or No! Guess Who. Tagged with: iterationQuizSelectionSequencing. Search for:. Recent Posts. View more recent posts View all our challenges Take a Quiz Our Latest Book.

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sequencing selection and iteration

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sequencing selection and iteration

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Sequence, Selection, and Iteration – The Building Blocks of Programming Languages

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