Data commit

Task/Eban-numbers/C/eban-numbers.c

@@ -0,0 +1,64 @@
+#include "stdio.h"
+#include "stdbool.h"
+
+#define ARRAY_LEN(a,T) (sizeof(a) / sizeof(T))
+
+struct Interval {
+    int start, end;
+    bool print;
+};
+
+int main() {
+    struct Interval intervals[] = {
+        {2, 1000, true},
+        {1000, 4000, true},
+        {2, 10000, false},
+        {2, 100000, false},
+        {2, 1000000, false},
+        {2, 10000000, false},
+        {2, 100000000, false},
+        {2, 1000000000, false},
+    };
+    int idx;
+
+    for (idx = 0; idx < ARRAY_LEN(intervals, struct Interval); ++idx) {
+        struct Interval intv = intervals[idx];
+        int count = 0, i;
+
+        if (intv.start == 2) {
+            printf("eban numbers up to and including %d:\n", intv.end);
+        } else {
+            printf("eban numbers between %d and %d (inclusive:)", intv.start, intv.end);
+        }
+
+        for (i = intv.start; i <= intv.end; i += 2) {
+            int b = i / 1000000000;
+            int r = i % 1000000000;
+            int m = r / 1000000;
+            int t;
+
+            r = i % 1000000;
+            t = r / 1000;
+            r %= 1000;
+            if (m >= 30 && m <= 66) m %= 10;
+            if (t >= 30 && t <= 66) t %= 10;
+            if (r >= 30 && r <= 66) r %= 10;
+            if (b == 0 || b == 2 || b == 4 || b == 6) {
+                if (m == 0 || m == 2 || m == 4 || m == 6) {
+                    if (t == 0 || t == 2 || t == 4 || t == 6) {
+                        if (r == 0 || r == 2 || r == 4 || r == 6) {
+                            if (intv.print) printf("%d ", i);
+                            count++;
+                        }
+                    }
+                }
+            }
+        }
+        if (intv.print) {
+            printf("\n");
+        }
+        printf("count = %d\n\n", count);
+    }
+
+    return 0;
+}