Computer Science

an expression that combines relational and logical operators

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

Logical operators

Using selection when developing programs

Arithmetic operators

Relational 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

To repeat a block of code multiple times.

To compare multiple conditions and return True or False.

What is the purpose of logical operators in programming?

Which of the following is True when both conditions are True?

The expression `(5 > 3) and (10 < 20)` evaluates to {{}}.

Which logical operator is used to reverse the result of a condition?

The expression `(8 < 3) and (5 > 2)` evaluates to {{}}.

What will be displayed if the user inputs "king" for value and "hearts" for suit?

```
if value == "king" and suit == "hearts":  
    print("Match")  
else:  
    print("Not a match") 
```

A {{}} compares two values and produces the result of True or False.

Match the arithmetic operator to the symbol:

Write the if statement command to check if the value stored in the variable called num is 10 or more.

What will be displayed if score is 5?
```if score < 5: 
    print ("You lose")
elif score <= 10:
    print ("Not bad!")
else:
    print ("You win")```

What will be displayed if score is 10?
```if score < 5: 
    print ("You lose")
elif score <= 10:
    print ("Not bad!")
else:
    print ("You win")```

What will be displayed if score is 11?
```if score < 5: 
    print ("You lose")
elif score <= 10:
    print ("Not bad!")
else:
    print ("You win")```

Starter Quiz

A compares two values and produces the result of True or False.