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# Functions using libraries

Built-in and Mathematical functions

Functions using libraries

### Built-in and Mathematical functions    ### Mathematical Functions ## What is Composition in functions?

The value returned by a function may be used as an argument for another function in a nested manner. This is called composition. For example, if we wish to take a numeric value or an expression as a input from the user, we take the input string from the user using the function input() and apply eval() function to evaluate its value, for example:

Example :

This program explains composition

>>>n1 = eval (input ("Enter a number: "))

Enter a number: 234

>>>n1

234

>>>n2 = eval (input ("Enter an arithmetic expression: "))

Enter an arithmetic expression: 12.0+13.0 * 2

>>> n2

38.0

Tags : Python , 12th Computer Science : Chapter 7 : Core Python : Python Functions
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12th Computer Science : Chapter 7 : Core Python : Python Functions : Functions using libraries | Python