foo.cc: In function ‘int main()’:
foo.cc:7:17: warning: ‘a’ may be used uninitialized [-Wmaybe-uninitialized]
    7 |         if(n>=10&&a<=99)
      |            ~~~~~^~~~~~~
foo.cc:5:15: note: ‘a’ was declared here
    5 |         int n,a;
      |               ^