ISRO CSE 2015 PYQ

#define hypotenuse (a, b) sqrt (a*a+b*b);
The macro call hypotenuse(a+2,b+3);

struct { 
    short x[5];  
    union { 
        float y; 
        long z; 
    } u;
 } t;
Assume that the objects of the type short, float and long occupy 2 bytes, 4 bytes and 8 bytes, respectively. The memory requirement for variable t, ignoring alignment consideration, is:

void foo(int x, int y)
{
    x+=y;
    y+=x;
}
main()
{
    int x=5.5;
    foo(x,x);
}
What is the final value of x in both call by value and call by reference, respectively?