题解 | #字符统计#

#include <cctype>
using namespace std;
int main()
{
    int Letters = 0,Digits = 0,Others = 0;
    char a;
    cin.get(a);
    while (a != '?')
    {
        if(isalpha(a))
        {
            Letters++;
        }
        else if(isdigit(a))
        {
            Digits++;
        }
        else
        {
            Others++;
        }
        cin.get(a);
    }
    cout << "Letters=" << Letters << endl;
    cout << "Digits=" << Digits << endl;
    cout << "Others=" << Others << endl;
    return 0; 
}