Consider the following function written in the C syntax: int foo (int a, int b)

Question

Consider the following function written in the C syntax: int foo (int a, int b) {a = b + 1; b = x * 2; return b - a;} In each of the cases below, assume that the initial values of the variables are x=1, y=2, and z=3. Write down the values of x, y and z after the following calls to foo (). If necessary, assume that output arguments are copied back to parameters in the left-to-right order. z = foo (x, y) where all parameters are passed by value z = foo (x, y) where all parameters are passed by reference z = foo(x, y) where all parameters are passed by value-result z = foo(y, y) where all parameters are passed by value z = foo(y, y) where all parameters are passed by reference z = foo(y, y) where all parameters are passed by value-result

Explanation / Answer

a)
x,y will remain unchanged, z will become -1

b)
x=3
y=6
z=3

c)
x=3
y=2
z=-1

d)
x=1
y=2
z=-1

e)
x=1
y=2
z=0

f)
x=1
y=2
z=-1

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