def evaluate(self):
while self._scanner.hasNext():
currentToken = self._scanner.next()
self._expressionSoFar += str(currentToken) + " "
if currentToken.getType() == Token.INT:
self._operandStack.push(currentToken)
elif currentToken.isOperator():
if len(self._operandStack) < 2:
raise Exception("Too few operands on the stack")
t2 = self._operandStack.pop()
t1 = self._operandStack.pop()
try:
result = Token(
self._computeValue(currentToken, t1.getValue(),
t2.getValue()))
except Exception as error:
return error
else:
self._operandStack.push(result)
else:
raise Exception("Unknown token type")
if len(self._operandStack) > 1:
raise Exception("Too many operands on the stack")
result = self._operandStack.pop()
return result.getValue()
def evaluate(self):
for currentToken in self._postfix:
self._expressionSoFar += str(currentToken) + " "
if currentToken.getType() == Token.INT:
self._operandStack.push(currentToken)
else:
t2 = self._operandStack.pop()
t1 = self._operandStack.pop()
result = Token(self._computeValue(currentToken,
t1.getValue(),
t2.getValue()))
self._operandStack.push(result)
result = self._operandStack.pop()
return result.getValue();
def evaluate(self):
"""Returns the value of the postfix expression."""
for currentToken in self._scanner:
if currentToken.getType() == Token.INT:
self._operandStack.push(currentToken)
elif currentToken.isOperator():
right = self._operandStack.pop()
left = self._operandStack.pop()
result = Token(self._computeValue(currentToken,
left.getValue(),
right.getValue()))
self._operandStack.push(result)
result = self._operandStack.pop()
return result.getValue();
def evaluate(self):
"""Returns the value of the postfix expression."""
for currentToken in self._scanner:
if currentToken.getType() == Token.INT:
self._operandStack.push(currentToken)
elif currentToken.isOperator():
right = self._operandStack.pop()
left = self._operandStack.pop()
result = Token(
self._computeValue(currentToken, left.getValue(),
right.getValue()))
self._operandStack.push(result)
result = self._operandStack.pop()
return result.getValue()
def evaluate(self):
while self._scanner.hasNext():
currentToken = Token(self._scanner.next())
self._expressionSoFar += str(currentToken) + " "
if currentToken.getType() == Token.INT:
self._operandStack.push(currentToken)
elif currentToken.isOperator():
if len(self._operandStack) < 2:
raise AttributeError(
"Too few operands on the stack")
t2 = self._operandStack.pop()
t1 = self._operandStack.pop()
result = Token(self._computeValue(
currentToken,int(t1.getValue()),
int(t2.getValue())))
self._operandStack.push(result)
else:
print(currentToken.getValue(),currentToken.getType())
raise AttributeError("Unknown token type")
if len(self._operandStack) > 1:
raise AttributeError("Too many operands \
on the stack")
result = self._operandStack.pop()
return result.getValue()
def evaluate(self):
"""Returns the value of the postfix expression."""
# For each token in our scanner or list,
# If it's an operand, push the token
# If it's an operator pop off two tokens from the stack,
# compute the value, and then push the value back on the stack as a new Token
for currentToken in self._scanner:
if currentToken.getType() == Token.INT:
self._operandStack.push(currentToken)
elif currentToken.isOperator():
right = self._operandStack.pop()
left = self._operandStack.pop()
result = Token(self._computeValue(currentToken,
left.getValue(),
right.getValue()))
self._operandStack.push(result)
# The result is the last thing left in the stack
result = self._operandStack.pop()
return result.getValue()
def evaluate(self):
while self._scanner.hasNext():
currentToken = self._scanner.next()
self._expressionSoFar += str(currentToken) + " "
if currentToken.getType() == Token.INT:
self._operandStack.push(currentToken)
elif currentToken.isOperator():
if len(self._operandStack) < 2:
raise AttributeError("Too few operands on the stack")
t2 = self._operandStack.pop()
t1 = self._operandStack.pop()
result = Token(self._computeValue(currentToken,
t1.getValue(),
t2.getValue()))
self._operandStack.push(result)
else:
raise AttributeError("Unknown token type")
if len(self._operandStack) > 1:
raise AttributeError("Too many operands on the stack")
result = self._operandStack.pop()
return result.getValue();
