math_func.cpp File Reference

Math functions. More...

#include "../stdafx.h"
#include "math_func.hpp"
#include "../safeguards.h"

Go to the source code of this file.

Functions
int	DivideApprox (int a, int b)
	Deterministic approximate division.
uint32_t	IntSqrt (uint32_t num)
	Compute the integer square root.

Detailed Description

Math functions.

Definition in file math_func.cpp.

Function Documentation

DivideApprox()

int DivideApprox	(	int	a,
		int	b )

Deterministic approximate division.

Cancels out division errors stemming from the integer nature of the division over multiple runs.

Parameters

a	Dividend.
b	Divisor.

Returns

a/b or (a/b)+1.

Definition at line 22 of file math_func.cpp.

References abs().

Referenced by StationViewWindow::BuildCargoList(), and StationViewWindow::EstimateDestinations().

IntSqrt()

uint32_t IntSqrt

(

uint32_t

num

)

Compute the integer square root.

Parameters

num

Radicand.

Returns

Rounded integer square root.

Note

Algorithm taken from http://en.wikipedia.org/wiki/Methods_of_computing_square_roots

Definition at line 42 of file math_func.cpp.

Referenced by CanalMaintenanceCost(), DemandCalculator::DemandCalculator(), RailMaintenanceCost(), RoadMaintenanceCost(), SignalMaintenanceCost(), and StationMaintenanceCost().