## 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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