/in/foo.cc:1:1: error: 'var' does not name a type
 var
 ^~~
/in/foo.cc:5:1: error: 'begin' does not name a type
 begin
 ^~~~~
/in/foo.cc:9:1: error: 'x' does not name a type
 x:=(m-1) div 2;
 ^
/in/foo.cc:11:1: error: 'y' does not name a type
 y:=n div m;
 ^
/in/foo.cc:13:1: error: 'z' does not name a type
 z:=n mod m;
 ^
/in/foo.cc:15:1: error: 'ans' does not name a type
 ans:=x*y;
 ^~~
/in/foo.cc:17:1: error: expected unqualified-id before 'if'
 if z
 ^~