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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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v_08_09
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8n09047a
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1990-05-15
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55 lines
Listing 2:
/* complex hyperbolic sine routine intended to test
argument passing and function returns only. This
version passes a pointer to a global array and re-
turns a pointer to a similar array. */
#include <dos.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define BIOS_DATA_SEG 0x40
#define TIMER_DATA 0x6c
#define TICKS_PER_DAY 0x01800B0L
long getticks(void);
void csinh(double*);
double cplxarg[2], cplxrtn[2];
main()
{
int ctr;
long start, end;
start = getticks();
printf("\n BEGIN AT CLOCK = %ld", start);
*cplxarg = 3.0;
*(cplxarg + 1) = -2.0;
for(ctr = 1; ctr <= 5000; ++ctr)
csinh(cplxarg);
end = getticks();
printf("\n\n REAL RESULT = %lG", *cplxrtn);
printf(" IMAG RESULT = %lG", *(cplxrtn + 1));
printf("\n END AT CLOCK = %ld", end);
printf("\n\n ELAPSED TICKS = %ld", end - start);
}
void csinh(double *arg)
{
*cplxrtn = cos(*(arg + 1)) * sinh(*arg);
*(cplxrtn + 1) = sin(*(arg + 1)) * cosh(*arg);
}