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| Summary |
#include <math.h> double acos ( double x); /* number to calculate arc cosine of */ | |
| Description | The acos function calculates the arc cosine of the floating-point number x whose value must be between -1 and 1. The floating-point value returned by acos is a number in the range 0-π. | |
| Return Value | The acos function returns the arc cosine of x. | |
| See Also | asin, atan, atan2 | |
| Example |
#include <math.h>
#include <stdio.h> /* for printf */
void tst_acos (void) {
float x;
float y;
for (x = -1.0; x <= 1.0; x += 0.1) {
y = acos (x);
printf ("ACOS(%f) = %f\n", x, y);
}
}
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