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   GNU Emacs Lisp Reference Manual
3.5: Numeric Conversions
To convert an integer to floating point, use the function float.
- Function: float number
- This returns number converted to floating point. If number is already a floating point number,
float returns it unchanged.
There are four functions to convert floating point numbers to integers; they differ in how they round. These functions accept integer arguments also, and return such arguments unchanged.
- Function: truncate number
- This returns number, converted to an integer by rounding towards zero.
- Function: floor number &optional divisor
- This returns number, converted to an integer by rounding downward (towards negative infinity).
If divisor is specified, number is divided by divisor before the floor is taken; this is the division operation that corresponds to mod. An arith-error results if divisor is 0.
- Function: ceiling number
- This returns number, converted to an integer by rounding upward (towards positive infinity).
- Function: round number
- This returns number, converted to an integer by rounding towards the nearest integer. Rounding a value equidistant between two integers may choose the integer closer to zero, or it may prefer an even integer, depending on your machine.
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