Stacks on Data Structure and Algorithms related Questions and Answers

Question :   Consider the stack | 5 | | 4 | | 3 | | 2 |. At this point, '*' is encountered. What has to be done? 1. 5*4=20 is pushed into the stack 2. * is pushed into the stack 3. 2*3=6 is pushed into the stack 4. * is ignored Answer :   1 - 5*4=20 is pushed into the stack