输入一个字符，判断其类型

#include<iostream>
using namespace std;
int main()
{
 char z;
 int i;
 z=getchar();
 if(z>='A'&&z<='Z')
 i=1;
 else if(z>='a'&&z<='z')
 i=2;
 else if(z>='0'&&z<='9')
 i=3;
 else 
 i=4;
 switch(i)
 {
  case 1:
   cout<<"大写字母"<<endl;
   break;
  case 2:
   cout<<"小写字母"<<endl;
   break;
  case 3:
   cout<<"数字"<<endl;
   break;
  case 4:
   cout<<"其他字符"<<endl;
   break;
 }
 return 0; 
}