버블 정렬

int arr[5] = { 1, 5, 3, 2, 7 };
 for ( int i = 0; i < 5; i++ )
 {
  for ( int j = i+1; j < 5-1; j++ )
  {
   if ( arr[i] > arr[j] )
   {
    int tmp = arr[j];
    arr[j] = arr[i];
    arr[i] = tmp;
   }
  }
 }