#include<conio.h>
#include<math.h>
int main()
{
long themang, n;
int sochuso;
float S = 0;
do
{
printf("\nNhap n: ");
scanf("%ld", &n);
}while(n < 0 && printf("\nLoi: n >= 0 !"));
sochuso = 0;
themang = n;
while(themang != 0)
{
if(themang % 2 == 0)
{
S = S + themang % 10;
} themang = themang / 10;
}
printf("\nTong cac chu so chan cua %ld la %f", n, S);
getch();
return 0;
}