Introduction - If you have any usage issues, please Google them yourself
Expression is the basic form of data operation. People' s writing habits are infix type, such as: 11+22* (7-4)/3. Infix calculator by operator precedence and the principle of priority in parentheses, are calculated the same level from left to right. There postfix expression (such as: 2274--* 3/11+) and prefix-style (such as:+ 11 /* 22--743). Suffix and prefix expressions expressions without parentheses, to the calculation of convenience. Calculated as the suffix appears, press operators have calculated. The design of the main tasks of the expression in the form of transformation and different forms of expression evaluation.