foo.cc: In function ‘int max(int*, int)’:
foo.cc:18:25: warning: ‘x’ may be used uninitialized [-Wmaybe-uninitialized]
   18 |                         if(x<a[i])
      |                         ^~
foo.cc:5:15: note: ‘x’ was declared here
    5 |         int i,x;
      |               ^