Else If Statement in Swift

In this tutorial, we will learn about else-if statements in Swift. We will cover the basics of conditional execution using if-else-if statements.

What is an Else-If statement

An else-if statement is a conditional statement that allows multiple conditions to be tested sequentially. It provides a way to execute different code blocks based on different conditions.

Syntax

The syntax for the else-if statement in Swift is:

if condition1 {
    // Code block to execute if condition1 is true
} else if condition2 {
    // Code block to execute if condition2 is true
} else {
    // Code block to execute if none of the conditions are true
}

The else-if statement evaluates the specified conditions in order. The first condition that is true will have its code block executed; if none of the conditions are true, the code block inside the else statement is executed.

Flowchart of Else-If Statement

Example 1: Checking if a Number is Positive, Negative, or Zero

  1. Declare a variable num.
  2. Assign a value to num.
  3. Use an if-else-if statement to check if num is positive, negative, or zero.
  4. Print a message indicating whether num is positive, negative, or zero.

Swift Program

let num = -5
if num > 0 {
    print("\(num) is positive.")
} else if num < 0 {
    print("\(num) is negative.")
} else {
    print("\(num) is zero.")
}

Output

-5 is negative.

Example 2: Checking the Grade of a Student

  1. Declare a variable marks.
  2. Assign a value to marks.
  3. Use an if-else-if statement to check the grade based on the marks.
  4. Print a message indicating the grade.

Swift Program

let marks = 85
if marks >= 90 {
    print("Grade: A")
} else if marks >= 80 {
    print("Grade: B")
} else if marks >= 70 {
    print("Grade: C")
} else if marks >= 60 {
    print("Grade: D")
} else {
    print("Grade: F")
}

Output

Grade: B

Example 3: Checking the Temperature Range

  1. Declare a variable temperature.
  2. Assign a value to temperature.
  3. Use an if-else-if statement to check the range of the temperature.
  4. Print a message indicating the temperature range.

Swift Program

let temperature = 75.5
if temperature > 100 {
    print("It's extremely hot.")
} else if temperature > 85 {
    print("It's hot.")
} else if temperature > 60 {
    print("It's warm.")
} else if temperature > 32 {
    print("It's cold.")
} else {
    print("It's freezing.")
}

Output

It's warm.