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   GNU Emacs Lisp Reference Manual
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.
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