Conditions: if, else, else if

Running one block or another depending on a condition: if, if-else, else-if chains, nested tests and multi-way selection, with the logic errors that come up most.

28 cards
7 topics
Free

Study this deck

The outline, topic by topic

Each topic is weighted the way the exam weighs it.

Concepts
Questions
Sort and link
Scenarios
Understand
Line by line
Tap what fits

A few cards from the deck

Conditional statement: what is it?
Show the answer
A statement that runs a block only if a test is true and, optionally, another block otherwise.
In Python: if, then else for the other case. At each pass, only one of the two blocks runs.
What does this program print?

```python
t = 25
if t > 10:
print("mild")
elif t > 20:
print("hot")
else:
print("cold")
`
- mild
- hot
- mild then hot
- cold
Show the answer
mild
25 satisfies t > 10: the first branch is taken and the chain stops there. The branch elif t > 20 is unreachable; test the highest threshold first.
In Python, … marks out the block of an if; in C and Java, … do.
Show the answer
In Python, indentation marks out the block of an if; in C and Java, braces do.
A line that returns to the level of the if no longer belongs to its block: it runs in every case.

Study this deck