52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/*
|
|
* Metro Siberia 4 - A sequel to Dark Storm's Metro Siberia 3 for CASIO calculators.
|
|
* Copyright (C) 2015 Dark Storm
|
|
* Copyright (C) 2022 Mibi88
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see https://www.gnu.org/licenses/.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
char* _itoa(int i, char b[])
|
|
{
|
|
char const digit[] = "0123456789";
|
|
char* p = b;
|
|
if(i<0){
|
|
*p++ = '-';
|
|
i *= -1;
|
|
}
|
|
int shifter = i;
|
|
do{ //Move to where representation ends
|
|
++p;
|
|
shifter = shifter/10;
|
|
}while(shifter);
|
|
*p = '\0';
|
|
do{ //Move back, inserting digits as u go
|
|
*--p = digit[i%10];
|
|
i = i/10;
|
|
}while(i);
|
|
return b;
|
|
}
|
|
|
|
|
|
#define PI 3.14159
|
|
#define M_PI_4 0.78539
|
|
#define FABS(x) ((x<0)?-x:x)
|
|
|
|
float _atan(float x)
|
|
{
|
|
return (x * (M_PI_4 - ((FABS(x) - 1) * (0.2447 + 0.0663 * FABS(x)))));
|
|
}
|