修改文件结构。

POP/08/Optional01.c

@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <stdbool.h>
+
+
+
+bool checkDigits(int chicken, int rabbit) {
+    bool digits[6] = {0};
+    int num = chicken*1000 + rabbit;
+    while (num > 0) {
+        if (num % 10 > 6 || digits[num % 10]) {
+            return false;
+        }
+        else {
+            digits[num % 10] = true;
+            num /= 10;
+        }
+    }
+    return true;
+}
+
+int main() {
+    int count = 50;
+    for (count = 50; count < 250; count++) {
+        if (checkDigits(count * 2, count * 4)) {
+            printf("There are %d chickens and rabbits. %d chicken legs, %d rabbit legs.", count, count*2, count*4);
+        }
+    }
+    return 0;
+}