Can u please explain why this code is giving this output:250#150, 250#100, 130#100

Question

def change(P,Q=30):
P=P+Q
Q=P-Q
print (P,'#',Q)
return (P)
R=150
S=100
R= change(R,S)
print (R,'#',S)
S= change(S)

Answer 1

def change(P,Q=30): // P=150 and Q=100, and Q will only be 30 when you do not pass a 2nd parameter.

P=P+Q // P=150+100=250
Q=P-Q // Q=250-100=150
print (P,'#',Q) // 250 # 150
return (P) // return 250

START HERE
--------------------
R=150
S=100
R= change(R,S) // function is called with 150,100 passed to it. Move to function.

R now holds 250 since it is returned from the function.

print (R,'#',S) // 250 # 100

Do the same for the function call below.
S= change(S)