输入一行最多包含80个字符的英语句子，统计其中大写字母，小写字母，数字，空格和其他字符的数量

以下是统计英语句子中大写字母，小写字母，数字，空格和其他字符数量的C++代码：

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

int main() {
    char str[81];
    int len, upper = 0, lower = 0, digit = 0, space = 0, other = 0;
    cout << "请输入字符串：";
    cin.getline(str, 81);
    len = strlen(str);
    for (int i = 0; i < len; i++) {
        if (str[i] >= 'A' && str[i] <= 'Z') {
            upper++;
        } else if (str[i] >= 'a' && str[i] <= 'z') {
            lower++;
        } else if (str[i] >= '0' && str[i] <= '9') {
            digit++;
        } else if (str[i] == ' ') {
            space++;
        } else {
            other++;
        }
    }
    cout << "大写字母：" << upper << endl;
    cout << "小写字母：" << lower << endl;
    cout << "数字：" << digit << endl;
    cout << "空格：" << space << endl;
    cout << "其他字符：" << other << endl;
    return 0;
}