题解 | #统计字符#

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


int main()
{    
    string str;
    getline(cin,str);
    int len = str.size();
    int ywcount = 0;
    int kgcount = 0;
    int szcount = 0;
    int qtcount = 0;

    for(int i = 0; i < len; i++){
        if(tolower(str[i]) >= 'a' && (str[i]) <= 'z'){
            ywcount++;
        }
        else if(str[i] >= '0' && str[i] <= '9'){
            szcount++;
        }
        else if(str[i] == ' '){
            kgcount++;
        }
        else{
            qtcount++;
        }
    }
    cout << ywcount <<endl;
    cout << kgcount <<endl;
    cout << szcount <<endl;
    cout << qtcount <<endl;
    
    return 0;
}