题解 | #统计字符#

using namespace std;

int main(void)
{
    int a=0,b=0,c=0,d=0;
    string str;
    getline(cin,str);
    for(int i =0;i<str.size();i++)
    {
        if(str[i]>='a'&&str[i]<='z')
        {
            a++;
        }
        else if(str[i]>='A'&&str[i]<='Z')
        {
            a++;
        }
        else if(str[i]>='0'&&str[i]<='9')
        {
            c++;
        }
        else if(str[i]==' ')
        {
            d++;
        }
        else b++;
    }
    cout<<a<<endl;
    cout<<d<<endl;
    cout<<c<<endl;
    cout<<b<<endl;
}