CS2 Conditionals

CS2 Conditionals Part 1

By Maria Cruz Farooqi

​Learning Target: I can create and use if statements with boolean expressions to solve problems with up to three variables and apply them to situations like making decisions in basic algorithms.

Dropdown

This image is an example of a concept in programming called ​

Select answer

. More specifically, selection allows our computers to ​

Select answer

, just like the image might help us make a decision on ​

Select answer

– if it’s hot outside, eat ​

Select answer

!

Dropdown

Conditional expressions are how we represent ​

Select answer

in our programs. More specifically, an expression occurs when values are combined using ​

Select answer

.  When you need to compare two values, you need to use a comparison operator. You can think of this like asking your computer a ​

Select answer

question. Except our computer uses True to represent “yes” and False to represent “no.” We say the ​

Select answer

when our computer answers the question.

Drag and Drop

If statements like this are called ​

Placeholder

because they ​

Placeholder

of a program. You can see this more clearly if we map out our program with a ​

Placeholder

. Just like “while loops,” the condition of an “if statement” is constructed from ​

Placeholder

, like count < 3. The shapes in the flowchart represent different types of actions. For example, the diamond shape represents a conditional statement

Drag these tiles and drop them in the correct blank above

control structures

control the flow

flowchart

boolean expressions

Drag and Drop

Let’s see how we can translate our flowchart into Python.

Notice the ​

Placeholder

in front of the ​

Placeholder

line of code? This line has been indented because it is in the ​

Placeholder

. All code in the body of the if statement should be ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

hero.say(“Attack Brak!”)

body of the if statement

indented

space

Dropdown

 Translate the following flowchart into a Python program.

We should use the variable that we use to store the name of the nearest enemy, like ‘​

Select answer

’.

We should ask if the nearest enemy is “​

Select answer

.” So ‘enemy == “skeleton”’.

Statements that tell the hero to ​

Select answer

‘Attack the skeleton’ should be in the ​

Select answer

.

Dropdown

​

Select answer

= hero.findNearestEnemy ( )

if (enemy ​

Select answer

"skeleton")

hero.​

Select answer

( "Attack the skeleton!")

Match

Match the following:

• The process of selectively running blocks of code only if certain conditions are met.

• A code block that executes another block of code only if a condition is true.    

• The combination of two or more values using a comparison operator.

• A conditional expression that is used to determine whether a block of code, like an if statement or a while loop, runs.

Selection

If Statement

Conditional Expression

Condition

• Selection

• If Statement

• Conditional Expression

• Condition