I need help in this question, I am trying so hard for last few days but i am not able to complete it, please help me, i will be very much thankful. I really need help in this.

2. Let prog be the WHILE++-program in Figure 1. Explain what program prog in Figure 1 returns as output for a given input d e D. In other words, state what [prog] WHILE++ (d) is for any d e D. (Don't describe the code in the program.) [14 marks) prog read L { foreach x in L { while x { Y:= cons nil Y; X:= tl x } } } write Y 2. Let prog be the WHILE++-program in Figure 1. Explain what program prog in Figure 1 returns as output for a given input d e D. In other words, state what [prog] WHILE++ (d) is for any d e D. (Don't describe the code in the program.) [14 marks) prog read L { foreach x in L { while x { Y:= cons nil Y; X:= tl x } } } write Y