Swift Comparison Operators

Swift Comparison Operators

In Swift, comparison operators are used to compare two values. These operators return a Boolean value (true or false) based on whether the comparison is true or false. Comparison operators are commonly used in conditional statements and loops to make decisions in your program.

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Comparison Operators in Swift

Here is a list of comparison operators available in Swift:

Operator	Description	Example
==	Equal to	5 == 5 returns true
!=	Not equal to	5 != 3 returns true
<	Less than	3 < 5 returns true
>	Greater than	5 > 3 returns true
<=	Less than or equal to	3 <= 5 returns true
>=	Greater than or equal to	5 >= 5 returns true

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Example: Demonstrating All Comparison Operators

This example shows how each comparison operator works:

File: main.swift

let a = 10
let b = 20

print("a == b: \(a == b)") // false
print("a != b: \(a != b)") // true
print("a < b: \(a < b)")   // true
print("a > b: \(a > b)")   // false
print("a <= b: \(a <= b)") // true
print("a >= b: \(a >= b)") // false

Explanation:

• a == b: Checks if a is equal to b. Returns false because 10 is not equal to 20.
• a != b: Checks if a is not equal to b. Returns true because 10 is not equal to 20.
• a < b: Checks if a is less than b. Returns true because 10 is less than 20.
• a > b: Checks if a is greater than b. Returns false because 10 is not greater than 20.
• a <= b: Checks if a is less than or equal to b. Returns true because 10 is less than 20.
• a >= b: Checks if a is greater than or equal to b. Returns false because 10 is not greater than 20.

Output:

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Use Cases of Comparison Operators

Example 1: Using Comparison Operators in Conditional Statements

Comparison operators are often used in if statements to make decisions:

File: main.swift

let temperature = 30

if temperature > 25 {
    print("It's a hot day!")
} else {
    print("The weather is pleasant.")
}

Explanation:

• The temperature is compared to 25 using the > operator.
• If the condition is true, the program prints “It’s a hot day!”; otherwise, it prints “The weather is pleasant.”

Output:

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Example 2: Using Comparison Operators in Loops

Comparison operators are frequently used in loops to control iterations:

File: main.swift

for i in 1...5 {
    if i % 2 == 0 {
        print("\(i) is even")
    } else {
        print("\(i) is odd")
    }
}

Explanation:

• The loop iterates through the numbers from 1 to 5.
• The % operator checks if the number is divisible by 2.
• The == operator is used to determine whether the remainder is equal to 0.

Output:

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Conclusion

Comparison operators are essential for decision-making and controlling program flow in Swift. Understanding how to use these operators effectively will help you write more robust and dynamic code.