题解 | #统计字符#

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

int main() {
 string str;
 getline(cin,str);
 int alpha=0,num=0,space=0,other=0;
 for(int i=0;i<str.size();i++){

    if(isalpha(str[i]))alpha++;
    else if(isspace(str[i]))space++;
    else if(isalnum(str[i]))num++;
    else other++;
 }
    cout<<alpha<<endl;
    cout<<space<<endl;
    cout<<num<<endl;
    cout<<other<<endl;
}
// 64 位输出请用 printf("%lld")