/in/foo.cc: In function 'int main()':
/in/foo.cc:7:7: error: expected primary-expression before '/' token
  if(c=/)
       ^
/in/foo.cc:7:8: error: expected primary-expression before ')' token
  if(c=/)
        ^
/in/foo.cc:9:8: error: expected primary-expression before ')' token
  if(c=*)
        ^
/in/foo.cc:11:8: error: expected primary-expression before ')' token
  if(c=+)
        ^
/in/foo.cc:13:8: error: expected primary-expression before ')' token
  if(c=-)
        ^