/in/foo.c:1:1: error: unknown type name 'program'
 program ex;
 ^~~~~~~
/in/foo.c:2:1: error: unknown type name 'var'
 var n,x,i,s:integer;
 ^~~
/in/foo.c:2:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
 var n,x,i,s:integer;
            ^
/in/foo.c:3:6: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
     a:array[1..1000]of integer;
      ^
/in/foo.c:3:13: error: too many decimal points in number
     a:array[1..1000]of integer;
             ^~~~~~~
/in/foo.c:5:1: error: unknown type name 'begin'
 begin
 ^~~~~
/in/foo.c:6:5: warning: parameter names (without types) in function declaration
     readln(n);
     ^~~~~~
/in/foo.c:7:5: error: expected identifier or '(' before 'for'
     for i:=1 to 1000 do
     ^~~
/in/foo.c:9:5: error: expected identifier or '(' before 'for'
     for i:=1 to n do
     ^~~
/in/foo.c:12:10: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
      a[x]:=1;
          ^
/in/foo.c:13:6: warning: data definition has no type or storage class
      end;
      ^~~
/in/foo.c:13:6: warning: type defaults to 'int' in declaration of 'end' [-Wimplicit-int]
/in/foo.c:14:6: error: expected '=', ',', ';', 'asm' or '__attribute__' before ':' token
     s:=0;
      ^
/in/foo.c:15:5: error: expected identifier or '(' before 'for'
     for i:=1 to 1000 do
     ^~~
/in/foo.c:17:5: warning: data definition has no type or storage class
     writeln(s);
     ^~~~~~~
/in/foo.c:17:5: warning: type defaults to 'int' in declaration of 'writeln' [-Wimplicit-int]
/in/foo.c:17:5: warning: parameter names (without types) in function declaration
/in/foo.c:18:5: error: expected identifier or '(' before 'for'
     for i:=1 to 1000 do
     ^~~
/in/foo.c:20:4: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
 end.
    ^