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### 3.7 Rounding Operations

The functions `ffloor`, `fceiling`, `fround`, and `ftruncate` take a floating-point argument and return a floating-point result whose value is a nearby integer. `ffloor` returns the nearest integer below; `fceiling`, the nearest integer above; `ftruncate`, the nearest integer in the direction towards zero; `fround`, the nearest integer.

Function: ffloor float

  This function rounds float to the next lower integral value, and returns that value as a floating-point number.

Function: fceiling float

  This function rounds float to the next higher integral value, and returns that value as a floating-point number.

Function: ftruncate float

  This function rounds float towards zero to an integral value, and returns that value as a floating-point number.

Function: fround float

  This function rounds float to the nearest integral value, and returns that value as a floating-point number. Rounding a value equidistant between two integers returns the even integer.