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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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vol_100
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162_01
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demo2.c
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1985-08-19
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/* file demo2.c */
/* Returns inverse sine, in radians and degrees,
or and error message if out of range. */
/* Use CTRL-C to exit from demo. */
#include fprintf.h
#define EOF -1
#define MAXL 40
extern float asin(),fdpi(),atof();
extern char *ftoa();
float rtod();
extern int b34arg;
extern int portc,portd;
main() {
static float fnuma,fnumb,fnumc;
static int len;
static char line[MAXL];
portd = 188; portc = 189; /* must be YOUR hardware ports */
while(len = getline(line,MAXL) < MAXL) {
fnuma = atof(line);
fnumb = asin(fnuma);
xpand1(); /* automatically external ? */
if(b34arg == 1)
printf("\n%g is out of range for inverse sine operation\n",fnuma);
else {
printf("\nInverse sine of %g is %f radians, ",fnuma,fnumb);
fnumc = rtod(fnumb);
printf("or %f degrees.\n",fnumc);
}
}
}
getline(s,lim) /* get line into s, return length */
char s[];
int lim;
{
int c,i;
i = 0;
while(--lim > 0 && (c=getchar()) != EOF && c != '\n')
s[i++] = c;
if (c == '\n')
s[i++] = c;
s[i] ='\0';
return(i);
}
float rtod(fn) /* convert Radians TO Degrees */
float fn;
{
return(fdpi(fn) * 180);
}