Question

Program uses the method isdigit to guard against improper input. III Request two numbers and find their sum. Validate the input. num1 = 1nput ("Enter I1rst number: ") num 2 = 1nput ("Enter second number: ") 8 Display sum 1 entries are valid. Otherwise, inform A the user where 1 nvalid entries vere made. 1f num1.1sdigit () and num 2,1sdig1t() : print ("The sum 1s′′,str(eval (num1) + बval (num2)) + ".") elif not num1.1sdigit( () : if not nun 2 , isdigit () : print("Ne1ther entry was a proper number.") elseProgram uses the method isdigit to guard against improper input. print'("Neither entry was a proper number. "Y else: print("The rirst entry was not a proper number.") [Run] Enter second entry was not a proper number.") Enter second number: six The second entry was not a proper number.

Answer 1

The use of isdigit() in a program is a method to validate that user input consists only of digits, but it is not sufficient for handling all numeric inputs such as negative numbers or numbers with decimal points. For robust integer validation, it is better to use a try-except block checking for a ValueError while converting input to integers and proceeding with sum operation only if conversion is successful.

Step-by-step explanation:

The use of isdigit() in a program ensures that the input provided by a user consists only of digits (0-9), which is a simple way to validate that a number was entered. However, isdigit() does not recognize negative numbers, numbers with decimal points, or any other characters as valid numeric input, even though they may be valid representations of numbers. Therefore, to accurately find the sum of two user-entered values while handling validation robustly, additional checks are required.

To validate if an input is a valid integer, you can use the following approach: try: num1 = int(input("Enter first number: ")) num2 = int(input("Enter second number: ")) print("The sum is " + str(num1 + num2) + ".") except ValueError: print("One or both entries were not proper numbers.") This will handle not just digits, but also negative integers and ensure that both inputs are indeed integers before calculating and displaying the sum.