题解

#include<iostream>
#include<string>
using namespace std;
int main(){
    string s;
    getline(cin,s);
    int english=0,number=0,other=0;
    for(int i=0;i<s.size();i++){
        if(s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z'){
            english++;
        }else if(s[i]>='0'&&s[i]<='9'){
            number++;
        }else{
            other++;
        }
    }
    cout<<"英文字母数量: "<<english<<endl;
    cout<<"数字数量: "<<number<<endl;
    cout<<"其他字符数量: "<<other;
    return 0;
}