what is the output of the program mentioned in the question.

Question

def test(func, arg):
return func(func(arg))

def mult(x):
return x * x

print(test(mult, 2))

***##The output is 16. how will we get that someone explain it

Answer 1

So there are 3 functions

lets start by mul(x)

What mul x does is return the square

def mul(x):
return x * x <--- as seen here

Now test(func, arg)
What it does is that it applies same function twice.

def test(func, arg):
return func( func(x) )

Now what we are printing is

print( test( mul, 2 ) )

so instead of func there is mul

So test will return

mul( mul(2) )

mul(2) will be 2 * 2 == 4

mul( 4 )

mul(4) will be 4 * 4 == 16