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# Functions

A function is a block of organized, reusable code that is used to perform a single, related action. Functions provide better modularity for your application and a high degree of code reusing.

Defining a Function

• In Python a function is defined using the def keyword followed by the function name and parenthesis.
```def my_function():
print("Hello InterviewBit")```
• Any input parameters or arguments should be placed within these parentheses. You can also define parameters inside these parentheses.
```def my_function(name):
print("Hello %s" %name)
```

Functions may return a value to the caller, using the keyword- ‘return’.

```def add_numbers(x, y):
return x + y```

Calling Function

Simply write the function’s name followed by (), placing any required arguments within the brackets.

```def my_function():
print("Hello InterviewBit")
return x + y

# print "Hello InterviewBit"
my_function()

print(val)
# print 5```

Functions with keyword arguments

• The arguments which have a default value are termed as keyword arguments and required ones are positional arguments.
• These arguments should always be the last ones, i.e. All the required (positional) arguments go first. They are then followed by the optional keyword arguments.
• Arguments without defaults are required otherwise you get a syntax error.
```def distance_travelled(t, u = 0, g = 9.81):
"""
Function distance_travelled calculates the distance travelled by an object
with initial speed u, in a time interval of t, where acceleration due to gravity is g

input: t (time taken), u (initial speed) g (acceleration due to gravity)
output: distance travelled

Example:
>>> distance_travelled(1.0)

4.905
"""
d = u*t + 0.5 * g * t**2
return d

print(distance_travelled(2.0))
print(distance_travelled(2.0, u = 1.0))
print(distance_travelled(2.0, g = 9.7))
print(distance_travelled(g = 9.7, t = 2.0))
```

Try the following example in the editor below.

You have to complete a function named factorial which will return the factorial of the integer N.
Note: Main code is already implemented, you need to complete the factorial function only.

Hints
• Hints are not available for this problem

## Discussion

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