acos, acosf
Visual Studio 2008
Calculate the arccosine.
double acos( double x ); float acos( float x ); // C++ only long double acos( long double x ); // C++ only float acosf( float x );
This program prompts for a value in the range -1 to 1. Input values outside this range will produce _DOMAIN error messages. If a valid value is entered, the program prints the arcsine and the arccosine of that value.
// crt_asincos.c
// arguments: 0
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
int main( int ac, char* av[] )
{
double x,
y;
errno_t err;
// argument checking
if (ac != 2)
{
fprintf_s( stderr, "Usage: %s <number between -1 and 1>\n",
av[0]);
return 1;
}
// Convert argument into a double value
if ((err = sscanf_s( av[1], "%lf", &x )) != 1)
{
fprintf_s( stderr, "Error converting argument into ",
"double value.\n");
return 1;
}
// Arcsine of X
y = asin( x );
printf_s( "Arcsine of %f = %f\n", x, y );
// Arccosine of X
y = acos( x );
printf_s( "Arccosine of %f = %f\n", x, y );
}
