Readme for the Calculator:

1. The calculator support operations involving only numbers and +,-,* and / operators
2. Negative numbers are supported
3. You can use decimal numbers also. Both 0.123 & .123 are supported
4. You can specify spaces between the operators used but not the numbers themselves. Eg. 123 * 43 + 12 is fine, but 12 23 + 23 is not!
5. A GET request is posted to the server when the button Calculate is pressed
6. The Calculator is built using only HTML and PHP

![Screenshot of the Demo Calculator] (https://github.com/mitshubh/math-calculator/blob/master/uploads/Screenshot.png)