If we need to perform mathematical calculations with user input, we must convert the input to an integer using the int() function; otherwise, it will default to a string. While two strings can be concatenated, mathematical operations require the strings to be converted to integers first. To simplify this, we use the int() function for conversion.

 

num1 = input("Enter number one: ") # prompt the user to enter a value

num2 = input("Enter number two: ") # prompt the user to enter a value

num1 = int(num1)

num2 = int(num2)

sum = num1 + num2

print("The sum of these two numbers is: " + str(sum))

 

Output: 

Enter number one: 5

Enter number two: 7

The sum of these two numbers is: 12