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| 19.2.1.acos |
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| Item | Value | | Header file | math.h | | Declaration | float acosf(float arg);
double acos(double arg);
long double acosl(long double arg); | | Return | The acos() returns the arc cosine of arg. | | Parameter | The argument must be in the range -1 to 1. |
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#include <math.h>
#include <stdio.h>
int main(void)
{
double val = -1.0;
do {
printf("Arc cosine of %f is %f.\n", val, acos(val));
val += 0.1;
} while(val<=1.0);
return 0;
}
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Arc cosine of -1.000000 is 3.141593.
Arc cosine of -0.900000 is 2.690566.
Arc cosine of -0.800000 is 2.498092.
Arc cosine of -0.700000 is 2.346194.
Arc cosine of -0.600000 is 2.214297.
Arc cosine of -0.500000 is 2.094395.
Arc cosine of -0.400000 is 1.982313.
Arc cosine of -0.300000 is 1.875489.
Arc cosine of -0.200000 is 1.772154.
Arc cosine of -0.100000 is 1.670964.
Arc cosine of 0.000000 is 1.570796.
Arc cosine of 0.100000 is 1.470629.
Arc cosine of 0.200000 is 1.369438.
Arc cosine of 0.300000 is 1.266104.
Arc cosine of 0.400000 is 1.159279.
Arc cosine of 0.500000 is 1.047198.
Arc cosine of 0.600000 is 0.927295.
Arc cosine of 0.700000 is 0.795399.
Arc cosine of 0.800000 is 0.643501.
Arc cosine of 0.900000 is 0.451027.
Arc cosine of 1.000000 is 0.000000. |
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