foo.cc: In function 'int main()':
foo.cc:10:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   10 |     if (j == 'X' && check == 10 || check == j - '0') {
      |         ~~~~~~~~~^~~~~~~~~~~~~~
foo.cc:5:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    5 |     scanf("%c-%c%c%c-%c%c%c%c%c-%c", &a, &b, &c, &d, &e, &f, &g, &h, &i, &j);
      |     ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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