java 2 10~

10번

package Pack01;
import java.util.concurrent.SynchronousQueue;
public class Hello {
    public static void main(String[] args) {
        //alt shift r 같은단어 바꾸기
        if(true) {
            System.out.println("호랑이1");
        }
        //
        if(true) {
            System.out.println("호랑이1");
        }else {
            System.out.println("호랑이2");
        }
        //
        if(false) {
            System.out.println("호랑이1");
        }else if(true) {
            System.out.println("호랑이2");
        }else if(true){
            System.out.println("호랑이3");
        }else {
            System.out.println("호랑이4");    
        }
        int a;
        /*if(3>2) {
            a=100;
        }else {
            a=200;
        }*/
        a= 3>2?100:200;
        System.out.println(a);
    }
}
 

11번

package Pack01;
import java.util.concurrent.SynchronousQueue;
public class Hello {
    public static void main(String[] args) {
        //alt shift r 같은단어 바꾸기
        for (int i = 0; i < 10; i++) {
            System.out.println(i);
        }System.out.println();//줄바꿈은 뒤에 그대로써서 한줄을 아낀다.
        
        for (int i = 0; i < 10; i++) {
            System.out.print(i + " ");
        }System.out.println();
        System.out.println();
        
        for (int i = 0; i < 10; i++) {
            System.out.println("5 * "+i +" "+"="+" "+i*5 );
        }System.out.println();
        
        int sum=0;
        for (int i = 1; i <= 10; i++) {
            sum+=i;
        }
        System.out.println(sum);
        
        for (int i = 0; i < 3; i++) {
            for (int j = 0; j < 4; j++) {
                //System.out.print("( "+i+" "+j+" )");
                System.out.printf("(%d %d)",i,j);
            }
            System.out.println();
        }
    }
}
 

12번

package Pack01;
import java.util.concurrent.SynchronousQueue;
public class Hello {
    public static void main(String[] args) {
        //alt shift r 같은단어 바꾸기
        int n =10;
        switch(n) {
        case 10 :
            System.out.println("새");
            break;
        case 20 :
            System.out.println("독수리");
            break;
        case 30 :
            System.out.println("앵무새");
            break;
        default :
            System.out.println("끝");
            break;
        }//switch ctrl space
        /*switch (key) {
        case value:

            break;

        default:
            break;*/
    }
}
 
 

12-1번

 

package Pack01;
import java.util.concurrent.SynchronousQueue;
public class Hello {
    public static void main(String[] args) {
        //alt shift r 같은단어 바꾸기
        int a=0;
        while(true) {
            System.out.println(a++);
            if(a>10) {
                System.out.println("프로그램을 종료합니다.");
                break;
            }
        }
    }
}
 
 

12-2번

package Pack01;
import java.util.concurrent.SynchronousQueue;
public class Hello {
    public static void main(String[] args) {
        //alt shift r 같은단어 바꾸기
        int a=0;
        while(true) {
            System.out.println(a);
            a++;
            if(a>10) {
                break;
            }
            if(a%2==0) {//짝수라면
                System.out.println(a+"continue");
                continue;
            }
        }
    }
}
 
 

12-3번

package Pack01;
import java.util.concurrent.SynchronousQueue;
public class Hello {
    public static void main(String[] args) {
        //ctrl shift r 같은단어 바꾸기
        int n=27;
        while(true) {
            if(n==1)
                break;
            /*if(n%2==0) {
                n=n/2;
            }
            else {
                n=n*3+1;
            }
            */
            n=(n%2==0)?n/2:n*3+1;
            System.out.println(n);
        }
    }
}