Python中的计算器循环

Question

需要向计算器添加一个循环，方法是给用户一个重新启动计算器的选项，将代码放入while循环，条件是用户的输入应该是'y'或'y'。

def add(x, y):
   return x + y

def subtract(x, y):
   return x - y

def multiply(x, y):
   return x * y

def divide(x, y):
   return x / y

print("Select operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")

choice = input("Enter choice(1/2/3/4):")

num1 = int(input("Enter first number: "))
num2 = int(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))
else:
   print("Invalid input")

Answer 1

给亚历克斯的帖子加些东西

cont = "y"
while cont.lower() == "y":
    print("Select operation\n1.Add\n2.Subtract\n3.Multiply\n4.Divide")

    choice = input("Enter choice(1/2/3/4):")

    num1 = int(input("Enter first number: "))
    num2 = int(input("Enter second number: "))

    if choice == '1':
       print(num1,"+",num2,"=", (num1 + num2))

    elif choice == '2':
       print(num1,"-",num2,"=", (num1 - num2))

    elif choice == '3':
       print(num1,"*",num2,"=", (num1 * num2))

    elif choice == '4':
       print(num1,"/",num2,"=", (num1 / num2))
    else:
       print("Invalid input")
    cont = input("Continue?y/n:")
    if cont == "n":
        break

Answer 2

不知道问题是什么，您可以使用另一个输入语句并检查while循环条件中的值。。。

cont = "y"
while cont == "y" or cont == "Y":
    print("Select operation.")
    print("1.Add")
    print("2.Subtract")
    print("3.Multiply")
    print("4.Divide")

    choice = input("Enter choice(1/2/3/4):")

    num1 = int(input("Enter first number: "))
    num2 = int(input("Enter second number: "))

    if choice == '1':
       print(num1,"+",num2,"=", (num1 + num2))

    elif choice == '2':
       print(num1,"-",num2,"=", (num1 - num2))

    elif choice == '3':
       print(num1,"*",num2,"=", (num1 * num2))

    elif choice == '4':
       print(num1,"/",num2,"=", (num1 / num2))
    else:
       print("Invalid input")
    cont = raw_input("Continue?y/n:")

Answer 3

您只需像这样修改代码

def continue():
    resp = input("Continue ? Y/N ")
    if resp == "n" or resp == "N":
        return False
    return True
while True:
    print("Select operation.")
    print("1.Add")
    print("2.Subtract")
    print("3.Multiply")
    print("4.Divide")

    choice = input("Enter choice(1/2/3/4):")

    num1 = int(input("Enter first number: "))
    num2 = int(input("Enter second number: "))

    if choice == '1':
       print(num1,"+",num2,"=", (num1 + num2))

    elif choice == '2':
       print(num1,"-",num2,"=", (num1 - num2))

    elif choice == '3':
       print(num1,"*",num2,"=", (num1 * num2))

    elif choice == '4':
       print(num1,"/",num2,"=", (num1 / num2))

    else:
       print("Invalid input")
    if not continue() :
       break

您可以随意更改continue函数