题解 | 统计字符

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

int main() {
    string s;
    int nc = 0, nk = 0, ni = 0, nq = 0;
    getline(cin, s);
    for(char c : s){
        if(c >= 'A' && c <= 'Z' || c >= 'a' && c <= 'z'){
            nc++;
        }else if(c == ' '){
            nk++;
        }else if(c >= '0' && c <= '9'){
            ni++;
        }else{
            nq++;
        }
    }
    cout << nc << endl;
    cout << nk << endl;
    cout << ni << endl;
    cout << nq << endl;
}
// 64 位输出请用 printf("%lld")