Question

Use python

Answer 1

Answer:

Here is the Python program:

def exec_2(f):

    f()

    f()

   

def exec_4(f):

    exec_2(f)

    exec_2(f)

   

def print_koala():

    print("koala")    

exec_4(print_koala)

Explanation:

The program works as follows:

First method:

def exec_2(f):

f()

f()

any function that is passed into exec_2() will be executed twice without parameters.

Second method:

def exec_4(f):

    exec_2(f)

    exec_2(f)

function exec_4(f) takes in a function f as a parameter and executes the function f 4 times using the function exec_2. At first exec_2(f) call the function f is executed twice and and second exec_2(f) call the function f is again executed twice so the function f executes 4 times in total.

Third method:

def print_koala():

    print("koala")  

a function that prints out the koala once

This function has a print statement which is passed the string koala to print on output screen.

exec_4(print_koala)

function exec_4 is used to print koala four times. This function exec_4 takes as argument the function print_koala() So this works as follows:

exec_4(print_koala)

The body of exec_4 executes as:

exec_2(print_koala)

exec_2(print_koala)

Now at first call to exec_2(print_koala) the program moves to the function exec_2 which executes print_koala()  method twice. Since print_koala() method has a print statement print("koala") so this is executed twice:

koala                                                                                                                                           koala

Now at second call exec_2(print_koala) the program moves to the function exec_2 which executes print_koala()  method twice again. Since print_koala() method has a print statement print("koala") so this is executed again twice:

koala                                                                                                                                           koala

So the output of the entire above program is:

koala                                                                                                                                           koala                                                                                                                                           koala                                                                                                                                           koala

The screenshot of program along with its output is attached.