Swift program to check if a number is odd or even

How to find if a number is even or odd in Swift:

A number is called an even number if it is divisible by 2, else it is odd. If you want to check if a number is odd or even, you can simply use the modulo % operator in Swift. We can also find out the remainder by using the isMultiple and remainder methods. In this post, I will show you how to iterate through the elements of an integer array and how to check odd/even for each number in that array.

Method 1: By using the modulo operator:

The modulo operator returns the remainder by dividing one number by a different number. The following example uses the modulo operator, % to check if a number is even or not:

var arr = [1,2,3,4,5,6]

for n in arr{
    if(n % 2 == 0){
        print("\(n) is even")
    }else{
        print("\(n) is odd")
    }
}

Download it on GitHub

In this example, the program is checking all numbers of arr. It uses a for loop and uses the modulo operator % to check if the numbers are even or odd. It prints one message if the number is even or odd.

Output :

If you run the above program, it will print the following output:

1 is odd
2 is even
3 is odd
4 is even
5 is odd
6 is even

Method 2: By using the isMultiple method:

The isMultiple is an instance method that returns one boolean value if a number is multiple of another number. The isMultiple method is defined as:

func isMultiple(of other: Self) -> Bool

It returns true if the number is multiple of another number, else it returns false.

var arr = [1,2,3,4,5,6]

for n in arr{
    if(n.isMultiple(of: 2)){
        print("\(n) is even")
    }else{
        print("\(n) is odd")
    }
}

Download it on GitHub

It prints the same output.

Method 3: How to use the remainder method with doubles:

Swift double provides the remainder instance method to find out the remainder of a division. The method is declared as:

func remainder(dividingBy other: Self) -> Self

It divides a number by a different number other and returns the remainder. The following example shows how it works:

var arr:[Double] = [1,2,3,4,5,6]

for n in arr{
    if(n.remainder(dividingBy: 2) == 0){
        print("\(n) is even")
    }else{
        print("\(n) is odd")
    }
}

Download it on GitHub

Output :

1.0 is odd
2.0 is even
3.0 is odd
4.0 is even
5.0 is odd
6.0 is even

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