/in/foo.cc:23:6: error: 'x' does not name a type
      x=a[ 1]-a[ n];
      ^
/in/foo.cc:24:5: error: 'y' does not name a type
     y=b[ 1]-b[ n];
     ^
/in/foo.cc:25:7: error: 'z' does not name a type
       z=x*x*1.0+y*y*1.0;
       ^
/in/foo.cc:26:6: error: 'ans' does not name a type
      ans=ans+sqrt( z);
      ^~~
/in/foo.cc:27:5: error: 'ans' does not name a type
     ans=ans+3.141596*2.0*m;
     ^~~
/in/foo.cc:28:11: error: expected constructor, destructor, or type conversion before '(' token
     printf("%.2f\n",ans );
           ^
/in/foo.cc:29:5: error: expected unqualified-id before 'return'
     return 0;
     ^~~~~~
/in/foo.cc:30:1: error: expected declaration before '}' token
 }
 ^