题解 | #统计字符#

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

int main() {
    string str;
    getline(cin, str);
    
    int letters = 0, spaces = 0, digits = 0, others = 0;
    
    for (char c : str) {
        if ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')) {
            letters++;
        } else if (c == ' ') {
            spaces++;
        } else if (c >= '0' && c <= '9') {
            digits++;
        } else {
            others++;
        }
    }
    
    cout << letters << endl;
    cout << spaces << endl;
    cout << digits << endl;
    cout << others << endl;
    
    return 0;
}

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String str = sc.nextLine();
        
        int letters = 0, spaces = 0, digits = 0, others = 0;
        
        for (char c : str.toCharArray()) {
            if (Character.isLetter(c)) {
                letters++;
            } else if (Character.isSpaceChar(c)) {
                spaces++;
            } else if (Character.isDigit(c)) {
                digits++;
            } else {
                others++;
            }
        }
        
        System.out.println(letters);
        System.out.println(spaces);
        System.out.println(digits);
        System.out.println(others);
    }
}

s = input()

letters = sum(1 for c in s if c.isalpha())
spaces = sum(1 for c in s if c.isspace())
digits = sum(1 for c in s if c.isdigit())
others = len(s) - letters - spaces - digits

print(letters)
print(spaces)
print(digits)
print(others)