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what is printed by pint stmt if P1 is assuming call by reference parameter passing?

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Program P1()
{
    x=10, y=3;
    func1(y,x,x);
    print x;
    print y; 
}
func1(x,y,z)
{
    y=y+4;
    z=x+y+4;
}


plzz elaborate the answer explanation?
thanks in advance.

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Program P1()
{
x=10, y=3;  at last x = 21 , y = 3
func1(&y,&x,&x);  //function call ( address of y ,address of x, address of x)
print x;        // x print = 21
print y;         // 3

}
func1(*x,*y,*z) // call comes here x= addresss of y , y= addresss of x , z= addresss of x  
*y= *y + 4;       // y contain = value at y address + 4 = 10 + 4 =14 
*z= *x + *y+4;      // z contain = value at address of y + value at address of y + 4 = 3 + 14 + 4=21
}

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