foo.c:1:2: error: invalid preprocessing directive #define_CRT_SECURE_NO_WARNINGS_1
    1 | #define_CRT_SECURE_NO_WARNINGS_1
      |  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
foo.c: In function 'main':
foo.c:8:25: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses]
    8 |         if (n >= 1 && n <= 10 ^ 16)
      |                       ~~^~~~~

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