Initial data commit

Task/Feigenbaum-constant-calculation/C/feigenbaum-constant-calculation.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+
+void feigenbaum() {
+    int i, j, k, max_it = 13, max_it_j = 10;
+    double a, x, y, d, a1 = 1.0, a2 = 0.0, d1 = 3.2;
+    printf(" i       d\n");
+    for (i = 2; i <= max_it; ++i) {
+        a = a1 + (a1 - a2) / d1;
+        for (j = 1; j <= max_it_j; ++j) {
+            x = 0.0;
+            y = 0.0;
+            for (k = 1; k <= 1 << i; ++k) {
+                 y = 1.0 - 2.0 * y * x;
+                 x = a - x * x;
+            }
+            a -= x / y;
+        }
+        d = (a1 - a2) / (a - a1);
+        printf("%2d    %.8f\n", i, d);
+        d1 = d;
+        a2 = a1;
+        a1 = a;
+    }
+}
+
+int main() {
+    feigenbaum();
+    return 0;
+}