자바 조건문 (if 사용)

 

 

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner num = new Scanner(System.in);
		System.out.print("분자");
		int a = num.nextInt();
		System.out.print("분모");
		int b = num.nextInt();
		
		if (b==0)
			System.out.println("0으로 나눌 수  없습니다");
		else
			System.out.printf("결과는 %d 입니다.",a/b);
		num.close();
	}

}

 

윤년 찾기

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner num = new Scanner(System.in);
		System.out.print("년도를 입력해주세요 : ");
		int year = num.nextInt();
			
		if ((year%4==0)&&((year%100!=0)||(year%400==0)))
			System.out.println(year + "년은 윤년입니다");
		else
			System.out.println(year + "년은 윤년이 아닙니다.");
		
		num.close();
	}
}

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner num = new Scanner(System.in);
		System.out.print("첫번째 :");
		double n1 = num.nextDouble();
		System.out.print("두번째 :");
		double n2 = num.nextDouble();		
		num.close();
		
		if(Math.abs(n1-n2)<= 0.01)
			System.out.println("소수점 2자리 까지 같습니다");
		else
			System.out.println("두 수는 다릅니다");
	}
}

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner num = new Scanner(System.in);
		int a = num.nextInt();
		
		if (a<10)
			System.out.println("small");
		else
			System.out.println("big");
		num.close();
	}
}

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner num = new Scanner(System.in);
		int a = num.nextInt();
		int b = num.nextInt();
		if (a>b)
			System.out.println(a+"-"+b);
		else if (a<b)
			System.out.println(b+"-"+a);
		else
			System.out.println(a+"="+b);
		num.close();
	}
}

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner num = new Scanner(System.in);
		int a = num.nextInt();
		
		if (a%7==0)
			System.out.println("7의 배수 입니다");
		else
			System.out.println("7의 배수가 아닙니다");
		num.close();
	}
}

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner num = new Scanner(System.in);
		int a = num.nextInt();
		
		if (a>=50 && a<=60)
			System.out.println("win");
		else
			System.out.println("lose");
			
		num.close();
	}
}

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner num = new Scanner(System.in);
		int a = num.nextInt();
		
		if (a>0)
			System.out.println("양수");
		else if (a<0)
			System.out.println("음수");
		else
			System.out.println("0");
		num.close();
	}
}

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner num = new Scanner(System.in);
		int n1 = num.nextInt();
		int n2 = num.nextInt();
		int n3 = num.nextInt();
		
		if ((n1<n2) && (n2<n3))
			System.out.println("증가");
		else if ((n1>n2) && (n2>n3))
			System.out.println("감소");
		else
			System.out.println("모두 아님");
		
		num.close();
	}
}

package ch2;
import java.util.Scanner;

public class study1 {
	public static void main(String[] args)
	{
		Scanner num = new Scanner(System.in);
		int n1 = num.nextInt();
		int n2 = num.nextInt();
		int n3 = num.nextInt();
		
		if (n1==n2 && n2==n3)
			System.out.println("세개의 수가 같습니다");
		else if ((n1==n2)||(n2==n3)||(n3==n1))
			System.out.println("두개의 수가 같습니다");
		else
			System.out.println("모든 수가 다릅니다");
		
		num.close();
	}
}