(Java)输入一个字母,若是小写字母,则变为大写输出,否则,原样输出
import java.util.Scanner;
public class Main {
public static void main(String[] args) {Scanner cin=new Scanner(System.in);String s=cin.nextLine();char c=s.charAt(0);if(Character.isLowerCase(c))System.out.println(Character.toUpperCase(c));elseSystem.out.println(c);}
}