#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
void main() {
int i;
int arr[] = { 1, 2, 10, 4, 8, 9, 5, 7, 6 };
int sum =0;
int num = sizeof(arr)/sizeof(int);
for( i=1; i<= num+1; i++){
sum += i;
}
for (i = 0; i < num; i++) {
sum -= arr[i];
}
if (sum == 0)
else
printf("빠진 숫자는 %d입니다.\n", sum
);
return 0;
}
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