输入一串字符，分别输出字母 数字 符号的个数，以$结束

# include <iostream>using namespace std;int main(){char ch;int xiao = 0;int da = 0;int num = 0;int space = 0;int qi = 0;cout << "请输入一串字符，以$结束：\n";while((ch = getchar()) != '$'){if(ch >= 'a' && ch <= 'z'){++xiao;}else if(ch >= 'A' && ch <= 'Z'){++da;}else if(ch >= 48 && ch <= 57){++num;}else if(ch == ' '){++space;}else{++qi;}}cout << "小写字母：" << xiao << endl << "大写字母：" << da << endl << "数字：" << num << endl << "空格：" << space << endl << "其他字符：" << qi << endl;return 0;}