creo q asi es mejor.chequea!
#include <iostream.h>
#include <process.h>
void dectobin(int);
void main(){
int dec;
cout << "\n\nIntroducir Decimal: ";
cin >> dec;
if (dec < 0){
cout << "\nERROR; Entrada no valida";
exit(0);
}
cout << "El numero en Binario es: ";
dectobin(dec);
}
void dectobin(int d){
int aux;
if (d > 0){
aux = d % 2;
d /= 2;
dectobin(d);
cout << aux;
}
}