HDU ACM 11 2017 字符串统计

#include <iostream>
#include <cctype>
#include <string>
using namespace std;
int main()
{
	int n, i = 0, num = 0;
	int y = 0;
	string Lu;
	cin >> n;
	while (i < n)
	{
		cin >> Lu;
		int x = Lu.length();
		for (y = 0; y < x; y++)
		{
			if (isdigit(Lu[y]))
				num++;
		}
		cout << num << endl;
		i++;
		y = 0;
		num = 0;
	}
	return 0;
}