(9)编写程序定义加、减、乘、除函数,完成简单计算器
时间: 2023-10-20 18:07:16 浏览: 109
以下是使用 Python 语言编写的简单计算器程序:
```python
def add(a, b):
return a + b
def subtract(a, b):
return a - b
def multiply(a, b):
return a * b
def divide(a, b):
if b == 0:
return "Error: cannot divide by zero"
else:
return a / b
print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")
while True:
choice = input("Enter choice (1/2/3/4): ")
if choice in ('1', '2', '3', '4'):
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))
if choice == '1':
print(num1, "+", num2, "=", add(num1, num2))
elif choice == '2':
print(num1, "-", num2, "=", subtract(num1, num2))
elif choice == '3':
print(num1, "*", num2, "=", multiply(num1, num2))
elif choice == '4':
print(num1, "/", num2, "=", divide(num1, num2))
break
else:
print("Invalid Input")
```
运行程序后,用户可以选择四种基本运算(加、减、乘、除),然后输入两个数字进行计算。如果用户尝试除以零,程序会返回错误信息。