need specific explain for each of them.

Problem 6 [12pt] Consider the following C-like program. Write down what will be printed out when the parameters are passed (1) by value, (2) by reference, (3) by value return and (4) by name. int x=5, y=6; void foo (int a, int b) a+b; a+a; x = b = main foo (x, y) print x, yi