Dec-03-2019, 11:05 AM

Hello, i have got a rpbolem with prefix to infix code.

I need to change this code, so it can work with input like this: +-4 2 3 or *4-2 3

and the output must be without useless parenthesis ............ 4-2+3 or 4*(2-3)

Can u help me please? Here is the code

I need to change this code, so it can work with input like this: +-4 2 3 or *4-2 3

and the output must be without useless parenthesis ............ 4-2+3 or 4*(2-3)

Can u help me please? Here is the code

class Calculator: def __init__ (self): self.stack = [] def push (self, p): if p in ['+', '-', '*', '/']: op1 = self.stack.pop () op2 = self.stack.pop () self.stack.append ('(%s %s %s)' % (op1, p, op2) ) elif p == '!': op = self.stack.pop () self.stack.append ('%s!' % (op) ) elif p in ['sin', 'cos', 'tan']: op = self.stack.pop () self.stack.append ('%s(%s)' % (p, op) ) else: self.stack.append (p) def convert (self, l): l.reverse () for e in l: self.push (e) return self.stack.pop () c = Calculator ()