Explain how to use user defined function in python with example?

Question: Explain how to use user defined function in python with example?

A user defined function in Python is a block of code that performs a specific task and can be reused in a program. To create a user defined function, we use the def keyword followed by the function name and parentheses. Inside the parentheses, we can optionally specify some parameters that the function can take as input. Then, we write the body of the function with an indented block of statements. The function can also return a value using the return statement.

For example, let's define a function that calculates the area of a circle given its radius:

python

def area_of_circle(radius):

pi = 3.14 # approximate value of pi

area = pi * radius ** 2 # formula for area of circle

return area # return the calculated area

```

To use this function, we can call it by its name and pass a value for the radius parameter:

```python

print(area_of_circle(5)) # prints 78.5

print(area_of_circle(10)) # prints 314.0

```

This is how we can use user defined functions in Python to perform specific tasks and reuse them in our programs.

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