The user enters 123. Which of the following code snippets will print 124 to the monitor? (Choose three.)

Question

Options

• Anum = input('Please enter your number: ') print(num + 1)
• Bnum = int(input('Please enter your number: ')) print(num + 1)
• Cnum = eval(input('Please enter your number: ')) print(num + 1)
• Dnum = input('Please enter your number: ') print(int(num) + 1)

Explanation

Options B, C, and D correctly print 124, because each one ensures the input is converted to an integer before arithmetic is performed. input() in Python 3 always returns a string, so "123" + 1 in Option A raises a TypeError - you cannot add an integer to a string directly, making A the one distractor. Option B converts at the point of input using int(), Option C uses eval() which evaluates the string "123" as a Python expression and returns the integer 123, and Option D stores the raw string but converts it with int() at print time - all three result in 123 + 1 = 124.

Memory tip: Think of input() as always handing you a string in quotes - "123" is not the same as 123. Any time you need math, you must unwrap the quotes with int(), float(), or eval() before or during the operation, not after.

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