/in/foo.cc: In function 'int main()':
/in/foo.cc:11:15: error: 'n' was not declared in this scope
   11 |         int a[n]={0},n=0;
      |               ^
/in/foo.cc:12:22: error: expected ';' before '>' token
   12 |         for(int i=n,i>0,i--){
      |                      ^
      |                      ;
/in/foo.cc:12:22: error: expected primary-expression before '>' token
/in/foo.cc:12:28: error: expected ';' before ')' token
   12 |         for(int i=n,i>0,i--){
      |                            ^
      |                            ;
/in/foo.cc:13:17: error: 'a' was not declared in this scope
   13 |                 a[i]=x%2;
      |                 ^