int tong (int n) {

int sum = 0;

while(n>0) {

sum+=n%10

n/=10;

}

return sum;

}

using namespace std;

int tong(int n) {

int sum=0

while(n>0) {

sum +=n%10;

}

return sum;

}

int main( ) {

int n;

cout<<’’ Nhap so nguyen duong n:”;

cin >> n;

if (n<=0) {

cout<<“So nhap vao khong phai so nguyen duong.”<< end l;

}else{

int sum=tong(n)

cout <<Tong cac chu so cua” << n <<“la:” <<sum<< endl;

}

return 0;

}

int tong (int n) {

int sum = 0;

while(n>0) {

sum+=n%10

n/=10;

}

return sum;

}

using namespace std;

int tong(int n) {

int sum=0

while(n>0) {

sum +=n%10;

}

return sum;

}

int main( ) {

int n;

cout<<’’ Nhap so nguyen duong n:”;

cin >> n;

if (n<=0) {

cout<<“So nhap vao khong phai so nguyen duong.”<< end l;

}else{

int sum=tong(n)

cout <<Tong cac chu so cua” << n <<“la:” <<sum<< endl;

}

return 0;

}

int tong (int n) {

int sum = 0;

while(n>0) {

sum+=n%10

n/=10;

}

return sum;

}

using namespace std;

int tong(int n) {

int sum=0

while(n>0) {

sum +=n%10;

}

return sum;

}

int main( ) {

int n;

cout<<’’ Nhap so nguyen duong n:”;

cin >> n;

if (n<=0) {

cout<<“So nhap vao khong phai so nguyen duong.”<< end l;

}else{

int sum=tong(n)

cout <<Tong cac chu so cua” << n <<“la:” <<sum<< endl;

}

return 0;

}