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/*
Challenge 026
Task #2
Create a script that prints mean angles of the given list of angles in degrees.
Please read wiki page that explains the formula in details with an example.
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
void* check_mem(void* p) {
if (!p) {
fputs("Out of memory\n", stderr);
exit(EXIT_FAILURE);
}
return p;
}
double mean_angle(double *angles, size_t size) {
double y = 0.0, x = 0.0;
for (size_t i = 0; i < size; i++) {
x += cos(angles[i] * M_PI / 180.0);
y += sin(angles[i] * M_PI / 180.0);
}
return atan2(y / (double)size, x / (double)size) * 180.0 / M_PI;
}
int main(int argc, char* argv[]) {
if (argc < 2) {
fputs("usage: ch-2 angles...\n", stderr);
return EXIT_FAILURE;
}
size_t size = argc-1;
double* angles = check_mem(malloc(size * sizeof(double)));
for (size_t i = 0; i < size; i++)
angles[i] = atof(argv[i+1]);
printf("%.1f", mean_angle(angles, size));
free(angles);
}
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