# Day 5: Calcutron 3000 – a simple shell calculator with validation

Our calculator takes in two numbers (float) and a type (sum, substract, multiplication and division). The Output looks like this The program is pretty self explaining. We put all the logic into the calc-function. When the User has finished his calculation we ask him if he wants to make another calculation or exit the program.

``````def calc():
print("******************************")
print("******* Calcutron 3000 *******")
print("******************************")
val1 = (input("Enter first value: "))
val2 = (input("Enter second value: "))
type = (input("Choose your operation: 1 = sum, 2 = substract, 3 = multiplication, 4 = division: "))
val1 = float(val1)  #change input string to float
val2 = float(val2)  #change input string to float
type = int(type) #change input string to int

#check if both val1/val2 are valid float numbers and if type is in the range between 1 and 4
if (isinstance(val1, float)) and (isinstance(val2, float)) and (1 <= type <= 4):
if (type==1):
print(val1 + val2)
elif (type==2):
print(val1 - val2)
elif (type==3):
print(val1 * val2)
elif (type==4):
print(val1 / val2)
else:
print("Error")
else:
print("Please enter valid numbers!") # handle wrong inputs

if (input("Another calculation? (y/n) " )=="y"):
calc()

calc()``````

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