37) What is the postfix form of the following prefix expression -A/B*C$DE

38) The data structure required to check whether an expression contains balanced parenthesis is

39) The postfix form of A*B+C/D is

40) Which of the following types of expressions does not require precedence rule when evaluated

41) The five items:A,B,C,D, and E are pushed in a stack, one after the other starting from A.The stack is popped four times and each element is inserted in a queue.Then two elements are deleted from the queue and pushed back on the stack.Now one item is popped from the stack. The popped item is