(left_operand, operator, right_operand) is the primary key for this table. This table contains a boolean expression that should be evaluated. operator is an enum that takes one of the values ('<', '>', '=') The
Implement a basic calculator to evaluate a simple expression string. The expression string contains only non-negative integers, +, -, *, / operators and empty spaces . The integer division should truncate toward zero. You may assume that the given expression is always valid. Some examples: "3...
s.push(Integer.valueOf(token));continue; }else//operators.contains(token) == true{inta =s.pop();intb =s.pop();if(token.equals("+")) s.push(b+a);if(token.equals("-")) s.push(b-a);if(token.equals("*")) s.push(b*a);if(token.equals("/")) s.push(b/a); } }return...