#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
 
void main() {
   int i;
   int arr[] = { 1, 2, 3, 5};
   int sum =0;
   int num = sizeof(arr)/sizeof(int);
 
   printf("%d\n", num); //9
 
   for( i=1; i<= num+1; i++){
   	sum += i;
   }
   printf("%d\n", sum); //45
 
   for (i = 0; i < num; i++) {
   	printf("점검:" + arr[i]);
      sum -= arr[i]; 
   }
 
   if (sum == 0)
      printf("빠진 번호는 없습니다.\n");
   else
      printf("빠진 숫자는 %d입니다.\n", sum);
 
 
   system("pause");
   return 0;
 
}

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