foo.cc: In function 'void isleap(int)':
foo.cc:13:10: warning: too many arguments for format [-Wformat-extra-args]
   13 |   printf("Yes\n",y);
      |          ^~~~~~~
foo.cc:15:11: warning: too many arguments for format [-Wformat-extra-args]
   15 |    printf("No\n",y);
      |           ^~~~~~
foo.cc: In function 'int main()':
foo.cc:6:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    6 |  scanf("%d",&y);
      |  ~~~~~^~~~~~~~~

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