I need to reset this calculator when user enter "$" instead first or second input number or user enter "$" end of the input number (ex: 5$,20$).
the (a,b) is input number1 and number2. it was assigned as global varibles.
select_op(choice) is function, running the operation that user need. input_function() is function for input two numbers.
# Functions for arithmetic operations.
def add(a,b):
return (a+b) # 'a' and 'b' will add.
def subtract(a,b):
return (a-b) # 'b' substract from 'a'.
def multiply(a,b):
return (a*b) #'a' multiply by 'b'.
def divide(a,b):
if b == 0 : .
return None
else:
return (a/b) # 'a' divided by 'b'.
def power(a,b):
return (a**b) # 'a' power of 'b'.
def remainder(a,b):
if b == 0:
return None
else:
return (a%b) # reminder of 'a' divided by 'b'.
#this function for out put of operation
def select_op(choice): #this function will select operation
if choice == "+":
input_function()
print(a,' + ',b,' = ',add(a,b))
elif choice == "-":
input_function()
print(a,' - ',b,' = ',subtract(a,b))
elif choice == "*":
input_function()
print(a,' * ',b,' = ',multiply(a,b))
elif choice == "/":
input_function()
if b==0:
print("float division by zero")
print(a,' / ',b,' = ',divide(a,b))
elif choice == "^":
input_function()
print(a,' ^ ',b,' = ',power(a,b))
elif choice == "%":
input_function()
if b==0:
print("float division by zero")
print(a,' % ',b,' = ',remainder(a,b))
elif choice == "#": #if choice is '#' program will terminate.
return -1
elif choice == "$": #if choice is '$' program reset.
return None
else:
print("Unrecognized operation")
#this function for input two operands.
def input_function():
number1=float(input("Enter first number: "))
number2=float(input("Enter second number: "))
global a,b
a=number1
b=number2
return a,b
#loop repeat until user need to terminate.
while True:
print("Select operation.")
print("1.Add : + ")
print("2.Subtract : - ")
print("3.Multiply : * ")
print("4.Divide : / ")
print("5.Power : ^ ")
print("6.Remainder: % ")
print("7.Terminate: # ")
print("8.Reset : $ ")
# take input from the user
choice = input("Enter choice(+,-,*,/,^,%,#,$): ")
print(choice)
if(select_op(choice) == -1):
#program ends here
print("Done. Terminating")
exit()
Be sure to check whether the string returned from input() ends with a "$" before converting it to a float.
To reset when a user types something that ends with "$", you could throw an exception to break out of your calculator logic and start over. We'll surround the stuff inside your while loop with a try/catch, so that the exception doesn't stop your program, but merely starts a new iteration in the while loop.
# I omitted all your other functions at the start of the file
# but of course those should be included as well
class ResetException(Exception):
pass
#this function for input two operands.
def input_function():
s = input("Enter first number: ")
if s.endswith("$"):
raise ResetException()
number1=float(s)
s = input("Enter second number: ")
if s.endswith("$"):
raise ResetException()
number2=float(s)
global a,b
a=number1
b=number2
return a,b
#loop repeat until user need to terminate.
while True:
print("Select operation.")
print("1.Add : + ")
print("2.Subtract : - ")
print("3.Multiply : * ")
print("4.Divide : / ")
print("5.Power : ^ ")
print("6.Remainder: % ")
print("7.Terminate: # ")
print("8.Reset : $ ")
# take input from the user
try:
choice = input("Enter choice(+,-,*,/,^,%,#,$): ")
print(choice)
if(select_op(choice) == -1):
#program ends here
print("Done. Terminating")
exit()
except ResetException:
pass