# How to Always Return a Negative Number in Ruby?

## Converting positive numbers to negative and leaving negative numbers unchanged

To make sure that you always return a negative number in Ruby, you can do either of the following:

## Using Unary Minus Operator

You can convert the number to its absolute form, and then negate it using the unary minus operator (`-`):

```-n.abs
```

This would convert a positive number to negative and ensure that an already negative number remains unchanged. For example, you can use this in the following way:

```def neg(num)
-num.abs
end

puts neg(1234) #=> -1234
puts neg(-1234) #=> -1234
```

## Using Arithmetic Operators

You can convert the number to its absolute form, and then negate it either by:

• Multiplying or dividing the number by `-1`, or;
• Subtracting the number from `0`.
```n.abs * -1
```
```n.abs / -1
```
```0 - n.abs
```

These would convert a positive number to negative and ensure that an already negative number remains unchanged. For example, you can use any of these in the following way:

```def neg(num)
num.abs * -1
end

puts neg(1234) #=> -1234
puts neg(-1234) #=> -1234
```
```def neg(num)
num.abs / -1
end

puts neg(1234) #=> -1234
puts neg(-1234) #=> -1234
```
```def neg(num)
0 - num.abs
end

puts neg(1234) #=> -1234
puts neg(-1234) #=> -1234
```

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