Function digit_sum

CPP/recursion/recursion2.cpp:15–18

	return array_sum(n-1,arr)+arr[n];
}
int digit_sum(int n){
	if(n==0) return 0;
	return digit_sum(n/10)+ n%10;
}
int main(){
	read(n);
	cout<<digit_sum(n)<<endl;