/in/foo.cc: In function 'bool Prime(int)':
/in/foo.cc:8:5: error: expected unqualified-id before 'for'
     for (i=2; i<n/2; i++){
     ^~~
/in/foo.cc:8:16: warning: statement has no effect [-Wunused-value]
     for (i=2; i<n/2; i++){
               ~^~~~
/in/foo.cc:8:25: error: expected ';' before ')' token
     for (i=2; i<n/2; i++){
                         ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (i=0; i<word.size(); i++)
               ~^~~~~~~~~~~~