RECF Programming Practice Test

What does the modulo operator (%) do?

It yields the quotient of division It yields the remainder of division (a % b gives the remainder of a divided by b) It yields the sum of a and b It yields the product a times b

Correct Answer:

It yields the remainder of division (a % b gives the remainder of a divided by b)

Explanation:

Modulo computes the remainder after dividing one number by another. When you divide a by b, you get a quotient (how many times b fits into a) and a remainder (what’s left). The expression a % b returns that remainder. For example, 7 % 3 is 1, because 3 goes into 7 twice with 1 leftover. Similarly, 9 % 3 is 0, since 3 fits perfectly into 9 with nothing left over. This is not the quotient, nor the sum, nor the product. Modulo is handy for tasks like checking if a number is even (n % 2 gives 0 for even numbers) or wrapping around indices in circular structures.

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