题解 | #统计字符#

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

int main() {
    string str;
    getline(cin, str);
    int letter = 0, space = 0, figure = 0, other = 0;
    for(int i = 0; i < str.length(); i++){
        switch (str[i]) {
            case 'a'...'z':
            case 'A'...'Z': letter++; break;
            case '0'...'9': figure++; break;
            case ' ': space++; break;
            default: other++; break;
        }
    }
    cout << letter << endl;
    cout << space << endl;
    cout << figure << endl;
    cout << other << endl;
    return 0;
}