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Step 3: Calculate area = 3.14 * radius * radius.

Step 4: Display area.
Step 5: Stop

More Than One Way to Solve a Problem

Sometimes, a single problem can have more than one correct algorithm to solve it. This is because
there can be different ways of thinking or solving a task logically.

Example 3: To check if a number is even
Method 1: Check if number is divisible by 2

if number % 2 = 0 then
Print "Even"

Method 2: Check if the last digit is 0, 2, 4, 6, or 8

if last digit in (0, 2, 4, 6, 8) then

Print "Even"
Both methods are correct and give the same result.

USING IF AND IF-THEN-ELSE CONDITIONS

While writing a program, we need to make certain decisions based on the logic of the program. Such
situations are called conditions. Conditional statements are used in a program to instruct the computer
to make a decision. The result of a condition will always be either True or False. The different conditional
statements used in a program are:

The if Statement

The if statement is the simplest conditional statement. Here, a statement or a collection of statements
within the if block is executed only if a certain condition or expression evaluates to True. If the condition
evaluates to False, then the control of execution is passed to the next statement after the if block.

Start

False
if condition

True

Statements in if
block execute

Stop

Syntax:

if (Test Expression)

#Logical Reasoning 87