How interpreter gives o/p reason behind the o/p?

Question

def sub(x,y):
return x-y
def sub(x,y):
return x/y
a = int(input("first number: "))
b = int(input("second number: "))
c = sub(a,b)
print(c)

Answer 1

-pop that baby in the playground
-hit run
-type any two numbers on seperate lines like so:
4
6
-hit submit

Theres no way we could know the answer to that. it requires user inputted numbers

Answer 2

I know the output but i also need to know the reason behind the output explain me that.....

Answer 3

The reason? It all seems pretty straightfoward. What are you having trouble with?