int main()
{                  //其實就是對ASCii表的操作
	string s;
	char a = 'a';
	int  b = a - '0';  //字元轉成數字
	int  c = (int)a;   //就是asc碼十進位制值,不加（int）也會隱式轉

	char d = a + 32;   //轉小寫
	char f = a - 32;   //轉大寫
	cout << a << endl << b << endl<<c<<endl<<d<<endl<<f<<endl;
return 0;
}
 

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