foo.cc: In function ‘int main()’:
foo.cc:7:16: warning: unnecessary parentheses in declaration of ‘i’ [-Wparentheses]
    7 |         for(int(i)=n;i<m;i++)
      |                ^~~
foo.cc:7:16: note: remove parentheses
    7 |         for(int(i)=n;i<m;i++)
      |                ^~~
      |                - -
foo.cc:10:26: warning: ‘x’ may be used uninitialized [-Wmaybe-uninitialized]
   10 |                         x=x+i;
      |                         ~^~~~
foo.cc:5:17: note: ‘x’ was declared here
    5 |         int m,n,x;
      |                 ^