This product offers simple and advanced calculators. It has been developed to serve people in their daily calculations. It can be used for both personal use and educational purposes. The two types of calculators have been designed to meet the user requirements by adding a lot of premium features and unique characteristics as follows:

A. Advance Calculator:

1. Totally free of charge.
2. Unlimited history.
3. Copy and paste are allowed.
4. You can type at any position within the equation.
5. You can add, append, delete and modify the equation as you want.
6. Similar to modern styles of calculators in terms of the diversity of functions.
7. Easy to use.
8. You can correct the mistake(s) in your equation in anytime and anywhere, without needing to repeat the calculations from scratch.
9. Choose your preferable direction view (Horizontal or Vertical).

B. Simple Calculator:

1. Totally free of charge.
2. Unlimited history.
3. Copy feature is available.
4. You can add, delete, and append at the end of your equation as you want.
5. Similar to modern styles of calculators in terms of the diversity of functions.
6. Easy to use.
7. You can correct the small mistake in your equation in anytime by pressing backspace button (Del), without needing to repeat the calculations from scratch.
8. Choose your preferable direction view (Horizontal or Vertical).

Important Rules:

To avoid unexpected results and any wrong answers; The equation should follow the rules of Arithmetic Precedence. Also, it should be written in a correct syntax. Here they are some samples which can be classified as Valid or Invalid syntax:

Valid Syntax:

2+3 or (2)+(3) or 2+(3) or (2)+3 or (2+3) (All are valid syntax)
PI+PI*PI/PI (Valid syntax)
SQRT(9)^2 (Valid syntax)
(2^2)*ABS(-3) (Valid syntax)
10^10+PI*SQRT(16)-1.55/0.0005 (Valid syntax)
.5+.5*.5/.5 (Valid syntax)

Invalid Syntax:

0.5.5 or .5.5 (Invalid syntax)
100SQRT10 (Invalid syntax)
PI5215 (Invalid syntax)
^10 (Invalid syntax)

Note: If your equation doesn't meet the rules; the system will trigger a generic error to tell you the following: "Check the Syntax of your formula".