题解 | #统计字符#

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

int main() {
    string str;
    getline(cin, str);
    int a = 0, b = 0, c = 0, d = 0;
    for (auto ch : str) {
        if (isalpha(ch)) {
            a++;
        } else if (ch == ' ') {
            b++;
        } else if (isdigit(ch)) {
            c++;
        } else d++;
    }
    cout << a << endl;
    cout << b << endl;
    cout << c << endl;
    cout << d << endl;
}
// 64 位输出请用 printf("%lld")