Last change
on this file since 7bf3856 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 7 years ago |
Imported original source code.
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File size:
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1 | /*
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2 | =============================================================================
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3 | sintest.c -- test the sin() function and floating point stuff
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4 | Version 1 -- 1987-08-10 -- D.N. Lynx Crowe
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5 | Setup for MetaComCo/Lattice C on the Atari 1040ST
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6 | =============================================================================
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7 | */
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8 |
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9 | #include "stdio.h"
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10 | #include "limits.h"
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11 | #include "math.h"
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12 |
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13 | #define NPTS 360
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14 | #define PI2 (2.0 * PI)
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15 | #define XI (PI2 / (float)NPTS)
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16 |
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17 | double points[NPTS]; /* array of y=sin(x) values */
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18 | double xvals[NPTS]; /* array of x values */
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19 |
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20 | main()
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21 | {
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22 | double x; /* temporary value */
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23 |
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24 | int i; /* temporary value */
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25 |
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26 | /* create an array of NPTS points of sin(x) from x=0 to 2 PI radians */
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27 |
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28 | for (i = 0; i < NPTS; i++) {
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29 |
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30 | x = (double)i * XI;
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31 | xvals[i] = x;
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32 | points[i] = sin(x);
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33 | }
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34 |
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35 | for (i = 0; i < NPTS; i++)
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36 | printf("%3d: sin(%2.6f) = %2.6f\n", i, xvals[i], points[i]);
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37 |
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38 | printf("XI = %3.6f, PI2 = %3.6f, PI = %3.6f\n", XI, PI2, PI);
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39 |
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40 | exit(0);
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41 | }
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