2016 Update

Task/Binary-digits/C/binary-digits.c

@@ -0,0 +1,27 @@
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+char *bin(uint32_t x);
+
+int main(void)
+{
+    for (size_t i = 0; i < 20; i++) {
+        char *binstr = bin(i);
+        printf("%s\n", binstr);
+        free(binstr);
+    }
+}
+
+char *bin(uint32_t x)
+{
+    size_t bits = (x == 0) ? 1 : log10((double) x)/log10(2) + 1;
+    char *ret = malloc((bits + 1) * sizeof (char));
+    for (size_t i = 0; i < bits ; i++) {
+       ret[bits - i - 1] = (x & 1) ? '1' : '0';
+       x >>= 1;
+    }
+    ret[bits] = '\0';
+    return ret;
+}