idiv.h File Reference

Macros for rounded integer division and percent. More...

#include "../base/ver.h"
#include "../base/check.h"

Go to the source code of this file.

Macros
#define	IDIV_ROUND(X, Y)   (((X)+(Y)/2)/(Y))
#define	IDIV_CEILING(X, Y)   (((X)+(Y)-1)/(Y))
#define	IDIV_WHOLE(X, Y)   ((((X)*10+(Y)/2)/(Y))/10)
#define	IDIV_TENTH(X, Y)   (((((X)-IDIV_WHOLE((X),(Y))*(Y)) * 10 + (Y)/2)) / (Y))
#define	IDIV_PERCENT(X, Y)   (((X)*100+((Y)/2))/(Y))

Detailed Description

Macros for rounded integer division and percent.

Macro Definition Documentation

#define IDIV_CEILING	(		X,
			Y
	)		(((X)+(Y)-1)/(Y))

Integer division, round up.

Note that this works only for non-negative numbers.

#define IDIV_PERCENT	(		X,
			Y
	)		(((X)*100+((Y)/2))/(Y))

Compute Percentage, round result.

#define IDIV_ROUND	(		X,
			Y
	)		(((X)+(Y)/2)/(Y))

Integer division, round result

Note that this works only for non-negative numbers.

#define IDIV_TENTH	(		X,
			Y
	)		(((((X)-IDIV_WHOLE((X),(Y))*(Y)) * 10 + (Y)/2)) / (Y))

Integer division with one decimal place, tenth.

Note that this works only for non-negative numbers.

#define IDIV_WHOLE	(		X,
			Y
	)		((((X)*10+(Y)/2)/(Y))/10)

Integer division with one decimal place, whole part.

Note that this works only for non-negative numbers.