Data commit

Task/Humble-numbers/C/humble-numbers.c

@@ -0,0 +1,48 @@
+#include <limits.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+bool isHumble(int i) {
+    if (i <= 1) return true;
+    if (i % 2 == 0) return isHumble(i / 2);
+    if (i % 3 == 0) return isHumble(i / 3);
+    if (i % 5 == 0) return isHumble(i / 5);
+    if (i % 7 == 0) return isHumble(i / 7);
+    return false;
+}
+
+int main() {
+    int limit = SHRT_MAX;
+    int humble[16];
+    int count = 0;
+    int num = 1;
+    char buffer[16];
+
+    memset(humble, 0, sizeof(humble));
+
+    for (; count < limit; num++) {
+        if (isHumble(num)) {
+            size_t len;
+            sprintf_s(buffer, sizeof(buffer), "%d", num);
+            len = strlen(buffer);
+            if (len >= 16) {
+                break;
+            }
+            humble[len]++;
+
+            if (count < 50) {
+                printf("%d ", num);
+            }
+            count++;
+        }
+    }
+    printf("\n\n");
+
+    printf("Of the first %d humble numbers:\n", count);
+    for (num = 1; num < 10; num++) {
+        printf("%5d have %d digits\n", humble[num], num);
+    }
+
+    return 0;
+}