In CSS, What is use for CALC() function ?

Question

Am new to css.I know only basics in css. I wonder what is the use clear:both.Please give some sample code for what is the use for this.

Answer 1

CSS calc() is a function used for simple calculations to determine CSS property values right in CSS. The calc() function allows mathematical expressions with addition (+), subtraction (-), multiplication (*), and division (/) to be used as component

Example:

width: calc(100% - 100px)