/in/foo.cc: In function 'int main()':
/in/foo.cc:14:13: error: 'add' was not declared in this scope; did you mean 'fadd'?
   14 |             add(x,1,a);
      |             ^~~
      |             fadd
/in/foo.cc:18:19: error: 'sum' was not declared in this scope; did you mean 'suma'?
   18 |             cout<<sum(y,a)-sum(x-1,b)<<endl;
      |                   ^~~
      |                   suma