Swift Double - isZero Property

Quiz

Swift provides a pre-defined property named as isZero. The isZero property is used to determine whether a given value is zero or not. It is equivalent to y == 0. In Swift, zero can be represented as either positive or negative, such as -0.0 or +0.0. Zero represents no value or an empty quantity.

For example, consider a number num = 3. Using the isZero property, we can check whether it is zero or not. In this case, num.isZero returns false, indicating the number is not zero.

Syntax

Double.isZero

Return Value

The isZero property returns a boolean value. If the value is zero, it returns true. Otherwise, it returns false.

Now we will discuss the usage of isZero property with the help of the following examples:

Example 1

Swift program to demonstrate the isZero property. Here we will provide various inputs to the property to check its response.

import Foundation

// Double Inputs
let number1 : Double = Double.infinity
let number2 : Double = 4.539202122
let number3 : Double = Double.nan
let number4 : Double = -3.32323232
let number5 : Double = 0.0
let number6 : Double = 0.5392021
let number7 : Double = +0.0
let number8 : Double = -0.0

// Checking whether the given value is zero or not
// Using isZero property
print("Is number 1 : \(number1) is zero?:", number1.isZero)
print("Is number 2 : \(number2) is zero?:", number2.isZero)
print("Is number 3 : \(number3) is zero?:", number3.isZero)
print("Is number 4 : \(number4) is zero?:", number4.isZero)
print("Is number 5 : \(number5) is zero?:", number5.isZero)
print("Is number 6 : \(number6) is zero?:", number6.isZero)
print("Is number 7 : \(number7) is zero?:", number7.isZero)
print("Is number 8 : \(number8) is zero?:", number8.isZero)

Output

Is number 1 : inf is zero?: false
Is number 2 : 4.539202122 is zero?: false
Is number 3 : nan is zero?: false
Is number 4 : -3.32323232 is zero?: false
Is number 5 : 0.0 is zero?: true
Is number 6 : 0.5392021 is zero?: false
Is number 7 : 0.0 is zero?: true
Is number 8 : -0.0 is zero?: true

Example 2

Swift program to determine whether the given expressions return the zero values or not using the isZero property.

import Foundation

// Double expressions
let expression1 : Double = 23.5545 * 0.0
let expression2 : Double = 3.2132323 - 3.2132323
let expression3 : Double = Double.infinity * 32.3
let expression4 : Double = Double.nan + 1.2

// Checking whether the given expression returns zero value or not
// Using isZero property
let output1 = expression1.isZero
let output2 = expression2.isZero
let output3 = expression3.isZero
let output4 = expression4.isZero

print("Is expression 1 return zero?:\(output1) Result: \(expression1)")
print("Is expression 2 return zero?:\(output2) Result: \(expression2)")
print("Is expression 3 return zero?:\(output3) Result: \(expression3)")
print("Is expression 4 return zero?:\(output4) Result: \(expression4)")

Output

Is expression 1 return zero?:true Result: 0.0
Is expression 2 return zero?:true Result: 0.0
Is expression 3 return zero?:false Result: inf
Is expression 4 return zero?:false Result: nan

Example 3

Swift program to divide two numbers. Here we first check if the given divisor is zero or not using the isZero property. If yes, then the division does not happen and if no, then it will divide the given number using the formula: output = dividend/divisor and display the result.

import Foundation
// Function to divide two numbers
func divide(dividend: Double, divisor: Double){
    
   // Checking if the divisor is zero or not
   if divisor.isZero{
      print("Divide is not possible because divisor is zero")
   }else{
      let output = dividend/divisor
      print("The result is:", output)
   }
}

// Inputs
var num1 = 10.2
var num2 = 0.0

// Calling function
divide(dividend:num1, divisor: num2)

Output

Divide is not possible because divisor is zero

Example 4

Swift program to check if the given array contains zero or not with the help of the isZero property and contains() methods.

import Foundation

// Array of double type
let numbers = [23.04, 0.0, 3.4, 8.2, 9.9, 3.3]

// Checking if the array contains 0 or not
if numbers.contains(where: { $0.isZero }) {
   print("Yes! The given array contains zero.")
} else {
   print("No! The given array does not contain zero.")
}

Output

Yes! The given array contains zero.

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