# I wrote the code in Python. Hope it won't be a problem.

def exchange(a,b):
    a = a+b
    b = a-b
    a = a-b
    return a,b



## Examples
exchange(-5,-10) # will return (-10,-5)
exchange(1,0)    # will return (0,1)

x = 5
y = 415

exchange(x,y) # will return (415, 5)