The basic mathematical operators in JavaScript include the following −
- Arithmetic Operators
- Comparison Operators
- Logical (or Relational) Operators
- Assignment Operators
Let’s see how Arithmetic operators work and what does it include −
| Sr.No | Operator and Description |
| 1 | + (Addition) Adds two operands Ex: A + B will give 30 |
| 2 | - (Subtraction) Subtracts the second operand from the first Ex: A - B will give -10 |
| 3 | * (Multiplication) Multiply both operands Ex: A * B will give 200 |
| 4 | / (Division) Divide the numerator by the denominator Ex: B / A will give 2 |
| 5 | % (Modulus) Outputs the remainder of an integer division Ex: B % A will give 0 |
| 6 | ++ (Increment) Increases an integer value by one Ex: A++ will give 11 |
| 7 | -- (Decrement) Decreases an integer value by one Ex: A-- will give 9 |
Example
You can try to run the following code to learn how to work Arithmetic Operators in JavaScript −
<html>
<body>
<script>
var a = 77;
var b = 30;
var c = "Demo";
var linebreak = "<br />";
document.write("a + b = ");
result = a + b;
document.write(result);
document.write(linebreak);
document.write("a - b = ");
result = a - b;
document.write(result);
document.write(linebreak);
document.write("a / b = ");
result = a / b;
document.write(result);
document.write(linebreak);
document.write("a % b = ");
result = a % b;
document.write(result);
document.write(linebreak);
document.write("a + b + c = ");
result = a + b + c;
document.write(result);
document.write(linebreak);
a = ++a;
document.write("++a = ");
result = ++a;
document.write(result);
document.write(linebreak);
b = --b;
document.write("--b = ");
result = --b;
document.write(result);
document.write(linebreak);
</script>
</body>
</html>