Computer Science

a symbol or word that instructs the computer to perform a specific calculation or action

an expression that results in a numeric value

sometimes known as floor division, is when any remainder of a division is discarded

an operation that gives you the remainder when one number is divided by another

Arithmetic operators

Using selection when developing programs

Relational operators

Logical operators

Nested selection

Good programming practices

Selection challenge

Programming project: selection I

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

a symbol that tells the computer to perform a calculation

the result of the division including decimal points

What does the modulo operator (%) return?

What will be displayed if the user inputs "Python"?

```print("Name the best programming language?")
language = input()
if language == "Python":
    print("Hi Pythonista")
else:
    print("Wrong!")```

What will this program output?

```number = 13
if number < 10:
    print("small")
elif number < 100:
    print("medium")
elif number < 1000:
    print("large")```

What will this program output if the user enters 0?

```print("Enter a number")
number = int(input())
if number >= 0:
    print(f"{number} is positive")
else:
    print(f"{number} is negative")```

If a program checks a condition and finds it to be False, what happens next?

used when there is more than one possible path for a program to follow

an expression that evaluates to True or False

used when there are multiple paths for a program to follow

What is the name of the shape used to represent a decision in a flow chart?

Arithmetic operators

Lesson outcome