first commit!

shellsort.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#define NUMBERS 1000000
+
+void print_arr(int[]);
+void shellsort(int[], int);
+
+void shellsort(int arr[], int n) {
+  int temp;
+
+  for (int gap = n / 2; gap > 0; gap /= 2)
+    for (int i = gap; i < n; ++i)
+      for (int j = i - gap; j >= 0 && arr[j] > arr[j + gap]; j -= gap) {
+        temp = arr[j];
+        arr[j] = arr[j + gap];
+        arr[j + gap] = temp;
+      }
+}
+
+int main() {
+  int ind, numbers[NUMBERS];
+  for (ind = NUMBERS; ind > 0; --ind) {
+    numbers[ind] = rand();
+  }
+
+  shellsort(numbers, NUMBERS);
+  // print_arr(numbers);
+  return 0;
+}
+
+void print_arr(int numbers[]) {
+  for (int ind = 0; ind < NUMBERS; ++ind) {
+    if (ind >= 10 && ind % 10 == 0)
+      printf("\n");
+    printf("%d ", numbers[ind]);
+  }
+}