Advanced Placement (AP) Computer Science

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What does the Floor() function do?

Returns the closest integer below a number
Returns the closest integer above a number
Calculates the sum of two numbers
Determines prime numbers

The correct answer is: Returns the closest integer below a number

The Floor() function is designed to take a numerical input and return the largest integer that is less than or equal to that input. This means that whenever you apply the Floor() function to a number, it effectively "rounds down" to the nearest whole number. For instance, if you were to pass the value of 3.7 to the function, it would return 3, since that is the closest integer below 3.7. Similarly, if you provided it with -2.3, the function would return -3, which is the nearest integer less than -2.3. This rounding behavior is particularly useful in various programming and mathematical applications, where controlling the precision of numerical values is important. The other options provided do not accurately describe the function's purpose: one entails rounding up, another involves addition, and the last one relates to determining prime numbers, none of which align with the functionality of Floor(). Thus, understanding that Floor() specifically deals with rounding down to the nearest integer is key to grasping its utility in coding and mathematical operations.