lab test for Nong Ying

test.java

public class test {
    public static void main(String args[]) {
	int x = 1;
	
	while(x != 0) {
	    x = Integer.valueOf(System.console().readLine("enter number: "));
	    switch (x) {
	    case 1: oddnum();
		break;
	    case 2: evennum();
		break;
	    case 3: print();
		break;
	    }
	}
    }

    private static void oddnum() {
	int x = Integer.valueOf(System.console().readLine("enter x: "));
	int y = Integer.valueOf(System.console().readLine("enter y: "));
	int z = Integer.valueOf(System.console().readLine("enter z: "));

	for (int i = x; i <= y; i++) {
	    if (i % z == 0 && i % 2 == 1) {
		System.out.print(i + " ");
	    }
	}

        System.out.println();
    }

    private static void evennum() {
    }

    private static void print() {
	int x = Integer.valueOf(System.console().readLine("enter number x: "));
	String seq = "AZYXWVUTSRQPONMLKJIHGFEDCB";

	if(x != 0) {
	   seq = seq.substring(x) + seq.substring(0, x);
	}

	System.out.println(seq);
    }
}

substring(x) มันคือตีดตั้งแต่ index x ถึงตัวสุดท้าย

substring(0, x) คือให้มันตัดตั้งแต่ตัวแรกถึง x - 1