static void Main() {
int count1 = 0;
int count2 = 0;
Console.WriteLine("请输入字符串");
string str = Convert.ToString(Console.ReadLine());
char[] chars = str.ToCharArray();
foreach(char num in chars){
if(num>='A' && num<='Z'){
count1++;
}else if(num>='a' && num<='z'){
count2++;
}
}
Console.WriteLine("大写个数为:"+count1);
Console.WriteLine("小写个数为:" + count2);
Console.ReadKey();
}