math.h File Reference

#include "headers/attributes.h"
#include "headers/extra_types.h"
#include "headers/simple_math.h"

Go to the source code of this file.

Functions
Mathematical uint64_t	digitsof (uint64_t num, unsigned base)
Mathematical int64_t	power (int64_t base, unsigned exp)
Mathematical uint64_t	upower (uint64_t base, unsigned exp)
Mathematical uint64_t	reverse_integer (uint64_t n, unsigned base)
Mathematical uint64_t	get_next_power_of_two (uint64_t)
Mathematical uint64_t	get_prev_power_of_two (uint64_t)

Function Documentation

digitsof()

Mathematical uint64_t digitsof	(	uint64_t	num,
		unsigned	base )

Math functions & other number operations. Returns how many digits ‹num› has in a specified base

Parameters

num	Any natural number
base	Whole number bigger than 0

Returns

Number of digits. For (num = 0) the function returns 0; if base < 0, the function returns -1

get_next_power_of_two()

Mathematical uint64_t get_next_power_of_two

(

uint64_t

)

Returns

smallest power of two bigger than the parameter

get_prev_power_of_two()

Mathematical uint64_t get_prev_power_of_two

(

uint64_t

)

Returns

biggest power of two smaller than the parameter

power()

Mathematical int64_t power	(	int64_t	base,
		unsigned	exp )

base ^ (to the power of) exp

Parameters

base	number
exp	exponent

Returns

base ^ exp

reverse_integer()

Mathematical uint64_t reverse_integer	(	uint64_t	n,
		unsigned	base )

Reverses the digits of the number n. Ignores lead zeroes, works in any base.

Example:

reverse_integer( 123, 10 )   // => 321
reverse_integer( 0xFA, 16 )  // => 0xAF
reverse_integer( 0b0101, 2 ) // => 0b101

Parameters

n	number to be reversed
base	numeric base of the number

Returns

digit-wise reverse of the original

upower()

Mathematical uint64_t upower	(	uint64_t	base,
		unsigned	exp )

base ^ (to the power of) exp

Parameters

base	unsigned number
exp	exponent

Returns

base ^ exp