The subtraction operator - subtracts one number from another.
You need to be aware of its behavior when subtracting two numbers of different types.
The following subtracts an integer from another:
print(7 - 8) //integer subtraction (-1)
If you subtract an integer from a double, the result is a double:
print(9.1 - 5) //double subtraction (4.1)
When you subtract a double from an integer, the result is a double:
print(9 - 4.1) //double subtraction (4.9)
The subtraction operator can also be used as a unary operator to indicate a negative number:
print(-25) //negative number
It can be used to negate the value of a variable:
var positiveNum = 5 var negativeNum = -positiveNum //negativeNum is now -5 positiveNum = -negativeNum //positiveNum is now 5