程序代码：

#include"stdio.h"
void main()
{
char ch;
int a=0,b=0,c=0;
while((ch=getchar())!='\0')
{
   if((ch<='Z' && cb>='A') || (ch<='z' && cb>='a'))
     {a++;}
    else if(ch<='9' && cb>='0')
            {b++;}
          else
             {c++;}
}
printf("字母有：%d,数字有：%d,其他字符有：%d",a,b,c);
}