f(x) = x + 4

Requirements:

• mathematical operations

A function is defined using the keyword def. A function is a sub program that can be called into action whenever we (the programmer) want.

In its simplest form, a function:

1. takes input

2. processes data, and

3. returns a result.

This is similar to math. Given the mathematical function f(x) = x + 4, when we call the function with f(6) we get a result of 10. In programming we can define similar functions but use a variety of data for x and return more than just numbers.

Your task

The function given is set up to receive an integer value for x. All you have to do is modify the return statement to have the function return x + 4 . The doc-string enclosed in the triple-quotes """ is optional and is there so that other programmers can quickly understand what the function needs to do its job and what it returns as a result.

Testing your code

After the function, and un-indented, call your function like above and print it out.

print(f(5))

Now hit run. The program will print the result of your function.

Starter Code

def f(x: int) -> int:
    """Returns the value of x plus 4
    
    Args:
        x: An integer
    Returns:
        Another integer, x + 4
    """
    return x

Tests

from main import f


def test_f():
    assert f(5) == 9
    assert f(6) == 10
    assert f(-4) == 0