tyanp

public class aaa {
	public static void main (String[] args) {
		int ran = (int)(Math.random()*50)+1;
		System.out.println("難易度を入力してください");
			String line2=System.console().readLine();
		int a=Integer.parseInt(line2);
		int c=0;
		switch (a) {
		case 1:
			c=30;

tyanp

public class bbb {
	public static void main (String[] args) {
		for(int i=1; i<=10; i++){
			for(int j=1; j<=10; j++){
			 System.out.printf("%1.3f", (double)i/j);
			}
			System.out.println("");
		}
	}
}