SW Expert Academy 2058. 자릿수 더하기

https://swexpertacademy.com/main/code/problem/problemDetail.do?contestProbId=AV5QPRjqA10DFAUq&categoryId=AV5QPRjqA10DFAUq&categoryType=CODE

SW Expert Academy

#include <iostream>


using namespace std;

int main()
{
	int sum = 0;
	int num = 0;
	cin >> num;
	int arr[4] = { 0, };

	arr[0] = num / 1000;
	arr[1] = (num / 100) - arr[0] * 10;
	arr[2] = (num / 10) - (arr[0] * 100 + arr[1] * 10);
	arr[3] = num - (arr[0] * 1000 + arr[1] * 100 + arr[2] * 10);

	for (int i = 0; i < 4; i++)
	{
		sum += arr[i];
	}
	cout << sum;
	return 0;
}