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

prog.c:4:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main() {
      ^~~~
prog.c: In function ‘main’:
prog.c:11:5: error: ‘sum’ undeclared (first use in this function); did you mean ‘num’?
     sum += arr[i];
     ^~~
     num
prog.c:11:5: note: each undeclared identifier is reported only once for each function it appears in
prog.c:17:5: warning: format not a string literal and no format arguments [-Wformat-security]
     printf("점검:" + arr[i]);
     ^~~~~~
prog.c:28:4: warning: implicit declaration of function ‘system’ [-Wimplicit-function-declaration]
    system("pause");
    ^~~~~~

Standard output is empty