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

The addition operator

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

Advanced mathematical operators

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.


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.

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