1 files changed, 45 insertions, 0 deletions
diff --git a/challenge-026/paulo-custodio/c/ch-2.c b/challenge-026/paulo-custodio/c/ch-2.c
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+++ b/challenge-026/paulo-custodio/c/ch-2.c
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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);
+}