Computer Science

a way of expressing an algorithm that is independent of a specific programming language

defines the main stages of software development

Programming project: selection I

Using selection when developing programs

Arithmetic operators

Relational operators

Logical operators

Nested selection

Good programming practices

Selection challenge

Programming project: selection II

In this unit pupils will explore the benefits of good programing practices and why subroutines are used in programs. They will create conditions in programs which use arithmetic, relational and logical expressions. They will develop their understanding of selection and explore nested selection.

Programming: selection

{{}} is a way of expressing an algorithm that is independent of a specific programming language.

When approaching a problem that will be solved using code, it is useful to follow the {{}} development life cycle.

At which stage of the software development life cycle do you start to create a program?

When writing pseudocode, keywords are often {{}}.

What comes next after the development stage of the systems development life cycle?

The following pseudocode is an example of __________: 
IF choice == "Sandwich":
    IF filling == "Cheese":
        price = 2.80
    ELSE:
        price = 3.00
ELSE:
   price = 2.00

A {{}} is a smaller section of a wider problem that has been decomposed to make solving the problem easier.

A f{{}} or pseudocode is often used to design a system before it is created.

What does this flowchart symbol represent?

If x holds the value 10, what will be output for the following code?

```if x > 10:
    print("x is greater than 10")
else:
    print("x is less than or equal to 10")```

What does the following flowchart symbol represent?

`username` has the value `"Izzy"` and `password` has `"Dog1234"`. What will be output?

```if username == "Izzy":
    if password == "Fish4321":
        print("Access granted")
print("...closing")```

Programming project: selection I

Lesson outcome