foo.cc: In function ‘int main()’:
foo.cc:8:13: error: expected primary-expression before ‘int’
    8 |         fot(int i=n;i<=m;i++)
      |             ^~~
foo.cc:8:21: error: ‘i’ was not declared in this scope
    8 |         fot(int i=n;i<=m;i++)
      |                     ^