자바 반복문 (while 문)

package ch2;

public class study1 {
	public static void main(String[] args)
	{
		int i = 1;
		while (i<=100)
		{
			System.out.print(i+" ");
			i+=2;
		}
			
	}
}

package ch2;

public class study1 {
	public static void main(String[] args)
	{
		int i =1;
		String num="", left ="";
		
		while (i<=30)
		{
			num = num + String.format("%3d",i);
			left = left + String.format("%3d",i%3);
			i++;
		}
		System.out.println(num);
		System.out.println(left);
	}
}

 

계산기

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner a = new Scanner (System.in);
		int b,c;
		char d;
		while (true)
		{
			System.out.println("예) 1 + 2 / 두 수에 0 대입시 중단");
			b= a.nextInt();
			d= (a.next()).charAt(0);
			c= a.nextInt();
			
			if (b==0 && c==0)
				break;
			
			switch (d)
			{
			case '+':
				System.out.printf("%d + %d = %d",b,c,b+c); break;
			case '-':
				System.out.printf("%d - %d = %d",b,c,b-c); break;
			case '*':
				System.out.printf("%d * %d = %d",b,c,b*c); break;
			case '/':
				System.out.printf("%d / %d = %d",b,c,b/c); break;
			case '%':
				System.out.printf("%d % %d = %d",b,c,b%c); break;
			default :
				System.out.println("잘못된 입력입니다.");	
			}
		}
		
	}
}