输入字符统计字符中大小写字母个数 C++。

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#include <iostream>

using namespace std;

int main()
{
    cout << "please enter str" << endl;
    string str;
    getline(cin,str);
    int count[5]={0,0,0,0,0};
    int num = str.size();
    for(int i=0;i<num;i++)
    {
        if('a' <= str[i] && str[i] <= 'z')
        {
            count[0]++;
        }
        else if('A' <= str[i] && str[i] <='Z')
        {
            count[1]++;
        }
        else if('0' <= str[i] && str[i] <= '9')
        {
            count[2]++;
        }
        else if (' ' == str[i])
        {
            count[3]++;
        }
        else
        {
            count[4]++;
        }
    }
    cout << "小写字母=" << count[0] << endl;
    cout << "大写字母=" << count[1] << endl;
    cout << "数字个数=" << count[2] << endl;
    cout << "空格数="  << count[3] << endl;
    cout << "其他字符数=" << count[4] << endl;
    return 0;
}

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