/in/foo.cc: In function 'int main()':
/in/foo.cc:56:18: error: 'getfa' was not declared in this scope
   _1=getfa(b[i].x);
                  ^
/in/foo.cc:59:3: error: 'prt' was not declared in this scope
   prt[_1]=_2;
   ^~~
/in/foo.cc:60:24: error: 'struct bian' has no member named 'z'
   DoubleAdd(_1,_2,b[i].z);
                        ^