1. Given that the stack is initially empty. What will it contain after these ins

Question

1.       Given that the stack is initially empty.
What will it contain after these instructions? (starting with the top)
       BiPush 1
       BiPush 2
       DUP
       BiPush 4
       BiPush 2
       BiPush 3
       IADD
       IF _ICMPEQ L1
       ISTORE x
L1 SWAP

2.       Given that the stack initially contains [0, 300] (starting with the top)
What will it contain after these instructions? (starting with the top)
L1   SWAP
       DUP      
       IFEQ L2
       BiPush -1
       IADD
       SWAP
       BiPush 2
       IADD
       GOTO L1
L2   POP

Write the Java code for this IJVM code:
2 points for the least number of correct statements, 1 point for all other correct answers.
                ILOAD x
                ILOAD y
                ISUB
                IFLT L1
                BiPUSH 2
                GOTO L2
L1                 ILOAD z
                BiPush 1
                IADD
L2           ISTORE z         

Explanation / Answer

this question has multiple subparts. I am answering the first 2.

1)

bipush 1 will push 1 in the stack. bipush 2 will push 2 in the stack.
stack will have 1 2

Dup will increase the size of the stack

and with three new bipush we will have 3 2 4 1 2 in stack

there will be add operation on the stack and a store to follow

2)

value in stack will be -1,0,300

after iadd it will add it and 2 will be pushed to stack

so stack will have 2,-1,0,300

with pop instruction 2 will be popped out of the stack. So finally stack will contain -1,0,300

2)

The code is to multiply x and y and storing the result in z

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