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When an operand is read, which of the following is done?

(a) It is placed on to the output

(b) It is placed in operator stack

(c) It is ignored

(d) Operator stack is emptied

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Correct choice is (a) It is placed on to the output

The best I can explain: While converting an infix expression to a postfix expression, when an operand is read, it is placed on to the output. When an operator is read, it is placed in the operator stack.

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