HDOJ 2017 字符串统计

#include<iostream>
#include<string>
using namespace std;

int main() {
    int n;
    cin >> n;
    while (n--) {
        string str;
        int num = 0;
        cin >> str;
        int len = str.size();
        for (int i = 0;i < len;i++) {
            if (isdigit(str[i])) num++;
        }
        cout << num << endl;
    }
    return 0;
}