練習問題1-1
System.out.print("Hello World")
System.out.print("Hello World")
Scanner scanner = new Scanner(System.in);
String A = scanner.nextLine();
System.out.println(A);
scanner.close();
double B = 10.5;
int A = (int) B;
char B = 'B';
double A = B;
char A = 'C';
System.out.print((int) A);