/in/foo.c: In function 'main':
/in/foo.c:5:5: error: expected identifier or '(' before '>>' token
  int>>n;
     ^~
/in/foo.c:6:2: error: 'cin' undeclared (first use in this function)
  cin>>n;
  ^~~
/in/foo.c:6:2: note: each undeclared identifier is reported only once for each function it appears in
/in/foo.c:6:7: error: 'n' undeclared (first use in this function)
  cin>>n;
       ^
/in/foo.c:7:6: error: expected '(' before 'n'
   if n<0&&n>=-109;
      ^
/in/foo.c:8:4: error: 'cout' undeclared (first use in this function)
    cout<<positive;
    ^~~~
/in/foo.c:8:10: error: 'positive' undeclared (first use in this function)
    cout<<positive;
          ^~~~~~~~
/in/foo.c:9:2: error: 'else' without a previous 'if'
  else if n>0&&n>=109;
  ^~~~
/in/foo.c:9:10: error: expected '(' before 'n'
  else if n>0&&n>=109;
          ^
/in/foo.c:10:10: error: 'negative' undeclared (first use in this function)
    cout<<negative;
          ^~~~~~~~
/in/foo.c:11:2: error: 'else' without a previous 'if'
  else if n==0;
  ^~~~
/in/foo.c:11:10: error: expected '(' before 'n'
  else if n==0;
          ^
/in/foo.c:11:7: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  else if n==0;
       ^~
/in/foo.c:12:3: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
   cout<<zero;
   ^~~~
/in/foo.c:12:9: error: 'zero' undeclared (first use in this function)
   cout<<zero;
         ^~~~
/in/foo.c:13:2: error: 'return0' undeclared (first use in this function)
  return0
  ^~~~~~~
/in/foo.c:14:1: error: expected ';' before '}' token
 }
 ^