输入一组字符，实现各字符的归类统计

#include <iostream>
#include <string.h>

using namespace std;

namespace xiaoli
{
    string str;
    int len;
}
using namespace xiaoli;

int main()
{
    getline(cin,str);//识别空格
    len = str.size();
    int a=0,b=0,c=0,d=0,e=0;
    for(int i=0;i<len;i++)
    {
        if(str[i]>='A'&&str[i]<='Z')
        {
            a++;
        }
        else if(str[i]>='a'&&str[i]<='z')
        {
            b++;
        }
        else if(str[i]>=48&&str[i]<=57)
        {
            c++;
        }
        else if(str[i]==' ')
        {
            d++;
        }
        else
        {
            e++;
        }
    }
    cout << "大写字母：" << a << endl;
    cout << "小写字母：" << b << endl;
    cout << "数字数量：" << c << endl;
    cout << "空格数量：" << d << endl;
    cout << "其他字符：" << e << endl;

    return 0;
}

实现效果