题解 | #统计字符#

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

int main() {
    string str;
    int a =0,b =0,c =0,d =0;
    getline(cin,str);
    for(int i =0;i <str.length();i++){
        if(isalpha(str[i])){
            a++;
        }
        if(isspace(str[i])){
            b++;
        }
        if(isdigit(str[i])){
            c++;
        }
        if(ispunct(str[i])){
            d++;
        }
    }
    cout << a <<endl;
    cout << b <<endl;
    cout << c <<endl;
    cout << d <<endl;
}