Data commit

Task/Sierpinski-triangle/C/sierpinski-triangle-1.c

@@ -0,0 +1,13 @@
+#include <stdio.h>
+
+#define SIZE (1 << 4)
+int main()
+{
+	int x, y, i;
+	for (y = SIZE - 1; y >= 0; y--, putchar('\n')) {
+		for (i = 0; i < y; i++) putchar(' ');
+		for (x = 0; x + y < SIZE; x++)
+			printf((x & y) ? "  " : "* ");
+	}
+	return 0;
+}

Task/Sierpinski-triangle/C/sierpinski-triangle-2.c

@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+
+#ifndef _POSIX_C_SOURCE
+char *strdup(const char *s)
+{
+  int l = strlen(s);
+  char *r = malloc(l+1);
+  memcpy(r, s, l+1);
+  return r;
+}
+#endif
+
+#define truth(X) ((X)=='*'?true:false)
+void rule_90(char *evstr)
+{
+  int i;
+  int l = strlen(evstr);
+  bool s[3];
+  char *cp = strdup(evstr);
+
+  for(i=0;i < l; i++) {
+    s[1] = truth(cp[i]);
+    s[0] = (i-1) < 0 ? false : truth(cp[i-1]);
+    s[2] = (i+1) < l ? truth(cp[i+1]) : false;
+    if ( (s[0] && !s[2]) || (!s[0] && s[2]) ) {
+      evstr[i] = '*';
+    } else {
+      evstr[i] = ' ';
+    }
+  }
+  free(cp);
+}

Task/Sierpinski-triangle/C/sierpinski-triangle-3.c

@@ -0,0 +1,18 @@
+void sierpinski_triangle(int n)
+{
+  int i;
+  int l = 1<<(n+1);
+  char *b = malloc(l+1);
+
+  memset(b, ' ', l);
+  b[l] = 0;
+  b[l>>1] = '*';
+
+  printf("%s\n", b);
+  for(i=0; i < l/2-1;i++) {
+    rule_90(b);
+    printf("%s\n", b);
+  }
+
+  free(b);
+}

Task/Sierpinski-triangle/C/sierpinski-triangle-4.c

@@ -0,0 +1,5 @@
+int main()
+{
+  sierpinski_triangle(4);
+  return EXIT_SUCCESS;
+}