def main():
#while loop will go on forever
n = 0
while (n <= 10):
try:
#ask user to enter the sequence in the right format as described
var = input('enter the thing you want to caculate' + ':' + ' ')
if var == 'quit':
return
else:
#call the evaluate method
a = RPNCalculator()
a = a.evaluate(var)
print(a)
#Catch the value Error
except ValueError:
print('INVALID')
def main():
#while loop will go on forever
n = 0
while(n <= 10):
try:
#ask user to enter the sequence in the right format as described
var = input('enter the thing you want to caculate'+':'+' ')
if var == 'quit':
return
else:
#call the evaluate method
a= RPNCalculator()
a = a.evaluate(var)
print (a)
#Catch the value Error
except ValueError:
print('INVALID')
class Calculator(object):
def __init__(self):
self.calcEngine = RPNCalculator()
self.opStack = Stack()
self.outLine = ''
def eval(self, line):
self.outLine = ''
i = 0
while i < len(line):
if line[i] == '(':
self.opStack.push('(')
elif line[i] == ')':
self.doParen()
elif line[i] in '+-*/':
self.doBinary(line[i])
elif line[i] in '0123456789':
self.outLine += line[i]
i = i + 1
while not self.opStack.isEmpty():
self.doOp(self.opStack.pop())
return self.calcEngine.eval(self.outLine)
def run(self):
while True:
line = raw_input('type an expression\n')
if len(line) == 0: break
print self.eval(line)
def doParen(self):
while self.opStack.top() != '(':
op = self.opStack.pop()
self.doOp(
op
) #do every single binary operation that is between the two parens
self.opStack.pop() #eventually remove the left paren
def doOp(self, op):
self.outLine += (' ' + op + ' ')
def prec(self, op):
if op == '/' or op == '*': return 2
elif op == '+' or op == '-': return 1
return 0
def doBinary(self, topop):
self.outLine += ' '
if self.opStack.isEmpty(): self.opStack.push(topop)
else:
nextop = self.opStack.top()
if self.prec(topop) <= self.prec(nextop):
self.doOp(nextop)
self.opStack.pop()
self.opStack.push(topop)
class Calculator(object):
def __init__(self):
self.calcEngine = RPNCalculator()
self.opStack = Stack()
self.outLine = ''
def eval(self, line):
self.outLine = ''
i = 0
while i < len(line):
if line[i] == '(':
self.opStack.push('(')
elif line[i] == ')':
self.doParen()
elif line[i] in '+-*/':
self.doBinary(line[i])
elif line[i] in '0123456789':
self.outLine += line[i]
i = i + 1
while not self.opStack.isEmpty():
self.doOp(self.opStack.pop())
return self.calcEngine.eval(self.outLine)
def run(self):
while True:
line = raw_input('type an expression\n')
if len(line) == 0: break
print self.eval(line)
def doParen(self):
while self.opStack.top() != '(':
op = self.opStack.pop()
self.doOp(op) #do every single binary operation that is between the two parens
self.opStack.pop() #eventually remove the left paren
def doOp(self, op):
self.outLine += (' ' + op + ' ')
def prec (self,op):
if op == '/' or op == '*': return 2
elif op == '+' or op == '-': return 1
return 0
def doBinary(self, topop):
self.outLine += ' '
if self.opStack.isEmpty(): self.opStack.push(topop)
else:
nextop = self.opStack.top()
if self.prec(topop) <= self.prec(nextop):
self.doOp(nextop)
self.opStack.pop()
self.opStack.push(topop)
def calc(self, exp):
variable = None
if "=" in exp:
variable, exp = exp.split("=")
RPN = InfixToRPN.convert_infix(exp, self.v_manager)
result = RPNCalculator.calc_expression(RPN, self.v_manager, [])
if variable:
self.v_manager.assign_variable(variable, result)
else:
return result
def __init__(self):
self.calcEngine = RPNCalculator()
self.opStack = Stack()
self.outLine = ''
def __init__(self):
self.calcEngine = RPNCalculator()
self.opStack = Stack()
self.outLine = ''
