foo.cc: In function 'int main()':
foo.cc:10:3: error: expected ';' before 'sum'
   sum+=i;
   ^~~
foo.cc:12:8: error: 'snm' was not declared in this scope
  cout<<snm;
        ^~~
foo.cc:12:8: note: suggested alternative: 'sum'
  cout<<snm;
        ^~~
        sum
foo.cc:6:10: warning: unused variable 'sum' [-Wunused-variable]
  int n,m,sum;
          ^~~

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