阿摩線上測驗
題組內容
一、請設計一程式，在輸入一個正整數四則運算式（只有加、減、乘、除四種運算，不
含括號）後，計算運算式並將結果輸出。假設所有運算一律採由左至右順序運算。
請注意：
⑵進行除法運算只取整數結 果，若無法整除時採捨去小數方式。例如：輸入整數四則運算式：121*3/2，計算結 果為 181。（25 分）
詳解 (共 1 筆)
詳解
這是一個簡單的解析器，它會根據由左至右的規則計算四則運算的結果，當進行除法時，它會捨去任何小數位數來只取整數結果。以下是該解析器的 Python 實現：
python
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def simple_calculator(expression):
# Initial total is the first number in the expression
elements = expression.split()
total = int(elements[0])
# Process the rest of the expression
i = 1
while i < len(elements):
operator = elements[i]
number = int(elements[i + 1])
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def simple_calculator(expression):
# Initial total is the first number in the expression
elements = expression.split()
total = int(elements[0])
# Process the rest of the expression
i = 1
while i < len(elements):
operator = elements[i]
number = int(elements[i + 1])
if operator == '+':
total += number
elif operator == '-':
total -= number
elif operator == '*':
total *= number
elif operator == '/':
total //= number # Use floor division to get an integer result
i += 2 # Move past the operator and number
total += number
elif operator == '-':
total -= number
elif operator == '*':
total *= number
elif operator == '/':
total //= number # Use floor division to get an integer result
i += 2 # Move past the operator and number
return total
# Example usage:
# expression = input("Enter an expression: ")
# result = simple_calculator(expression)
# print("The result is:", result)
# expression = input("Enter an expression: ")
# result = simple_calculator(expression)
# print("The result is:", result)
# Since we cannot get user input in this environment, let's use the given example
example_expression = "121 * 3 / 2"
result = simple_calculator(example_expression.replace('*', ' * ').replace('/', ' / '))
print("The result is:", result)
example_expression = "121 * 3 / 2"
result = simple_calculator(example_expression.replace('*', ' * ').replace('/', ' / '))
print("The result is:", result)