foo.cc:3:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    3 | main() {
      |      ^
foo.cc: In function 'int main()':
foo.cc:12:10: warning: too many arguments for format [-Wformat-extra-args]
   12 |   printf("Yes\n", x);
      |          ^~~~~~~
foo.cc:14:10: warning: too many arguments for format [-Wformat-extra-args]
   14 |   printf("No\n", x);
      |          ^~~~~~
foo.cc:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |  scanf("%d", &x);
      |  ~~~~~^~~~~~~~~~

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