# Operators

Every variable in JavaScript is casted automatically so any operator between two variables will always give some kind of result.

The `+` (addition) operator is used both addition and concatenation of strings.

For example, adding two variables is easy:

``````var a = 1;
var b = 2;
var c = a + b;     // c is now equal to 3
``````

The addition operator is used for concatenating strings to strings, strings to numbers, and numbers to strings:

``````var name = "John";
print("Hello " + name + "!");
print("The meaning of life is " + 42);
print(42 + " is the meaning of life");
``````

### Mathematical operators

To subtract, multiply and divide two numbers, use the minus (`-`), asterisk (`*`) and slash (`/`) signs.

``````print(3 - 5);     // outputs -2
print(3 * 5);     // outputs 15
print(3 / 5);     // outputs 0.6
``````

JavaScript supports the modulus operator (`%`) which calculates the remainder of a division operation.

``````print(5 % 3);     // outputs 2
``````

Instead of typing something like myNumber=myNumber*2, you can use myNumber*=2. There are the following shortcuts like that: *= -= += /=

JavaScript also has a `Math` module which contains more advanced functions:

• `Math.abs` calculates the absolute value of a number
• `Math.exp` calculates e to the power of a number
• `Math.pow(x,y)` calculates the result of x to the power of y
• `Math.floor` removes the fraction part from a number
• `Math.random()` will give a random number `x` and 0<=x<1

And many more mathematical functions.

### Challenge

In this exercise, you do the following:

1. Connect the `firstName` and `lastName` to construct the variable `fullName`, but with a space (`" "`) in between the first and last name.
2. Multiply the variable `myNumber` by 2 and put the result in `meaningOfLife`.