VERIFICAR O CNPJ !!! COMO FACO

function cpf(num: string): boolean;
function cgc(num: string): boolean;
implementation
uses SysUtils;


function cpf(num: string): boolean;
var
n1,n2,n3,n4,n5,n6,n7,n8,n9: integer;
d1,d2: integer;
digitado, calculado: string;
begin
n1:=StrToInt(num[1]);
n2:=StrToInt(num[2]);
n3:=StrToInt(num[3]);
n4:=StrToInt(num[4]);
n5:=StrToInt(num[5]);
n6:=StrToInt(num[6]);
n7:=StrToInt(num[7]);
n8:=StrToInt(num[8]);
n9:=StrToInt(num[9]);
d1:=n9*2+n8*3+n7*4+n6*5+n5*6+n4*7+n3*8+n2*9+n1*10;
d1:=11-(d1 mod 11);
if d1>=10 then d1:=0;
d2:=d1*2+n9*3+n8*4+n7*5+n6*6+n5*7+n4*8+n3*9+n2*10+n1*11;
d2:=11-(d2 mod 11);
if d2>=10 then d2:=0;
calculado:=inttostr(d1)+inttostr(d2);
digitado:=num[10]+num[11];
if calculado=digitado then
cpf:=true
else
cpf:=false;
end;


function cgc(num: string): boolean;
var
n1,n2,n3,n4,n5,n6,n7,n8,n9,n10,n11,n12: integer;
d1,d2: integer;
digitado, calculado: string;
begin
n1:=StrToInt(num[1]);
n2:=StrToInt(num[2]);
n3:=StrToInt(num[3]);
n4:=StrToInt(num[4]);
n5:=StrToInt(num[5]);
n6:=StrToInt(num[6]);
n7:=StrToInt(num[7]);
n8:=StrToInt(num[8]);
n9:=StrToInt(num[9]);
n10:=StrToInt(num[10]);
n11:=StrToInt(num[11]);
n12:=StrToInt(num[12]);
d1:=n12*2+n11*3+n10*4+n9*5+n8*6+n7*7+n6*8+n5*9+n4*2+n3*3+n2*4+n1*5;
d1:=11-(d1 mod 11);
if d1>=10 then d1:=0;
d2:=d1*2+n12*3+n11*4+n10*5+n9*6+n8*7+n7*8+n6*9+n5*2+n4*3+n3*4+n2*5+n1*6;
d2:=11-(d2 mod 11);
if d2>=10 then d2:=0;
calculado:=inttostr(d1)+inttostr(d2);
digitado:=num[13]+num[14];
if calculado=digitado then
cgc:=true
else
cgc:=false;
end;
end.


02) Dica melhorada por um dos colaboradores
function CalculaCnpjCpf(Numero : String) : String;
var
i,j,k, Soma, Digito : Integer;
CNPJ : Boolean;
begin
Result := Numero;
case Length(Numero) of
9:
CNPJ := False;
12:
CNPJ := True;
else
Exit;
end;
for j := 1 to 2 do
begin
k := 2;
Soma := 0;
for i := Length(Result) downto 1 do
begin
Soma := Soma + (Ord(Result[i])-Ord(´0´))*k;
Inc(k);
if (k > 9) and CNPJ then
k := 2;
end;
Digito := 11 - Soma mod 11;
if Digito >= 10 then
Digito := 0;
Result := Result + Chr(Digito + Ord(´0´));
end;
end;