JAVA 3일차 3

반복문

public class Loop1 {

    public static void main(String[] args) {

        int n = 10;
        int j =20;

        for(int i = 0; i < n; i++){ /* 0 부터 9 까지 10번 반복해*/
            System.out.print(i);
            if(i < n-1) {
                System.out.print(", ");
            }
        }
        System.out.println();

        for(int k =10; k < j; k++){
            System.out.print(k);
            if (k < j-1){
                System.out.print(", ");
            }
        }
        System.out.println();

        for (int i =10; i > 0; i--){
            System.out.print(i);
            if (i < n +1){
                System.out.print(", ");
            }
        }
        System.out.println();

        for(int k =20; k > 10; k--){
            System.out.print(k);
            if (k < j+1){
                System.out.print(", ");
            }
        }
        System.out.println();
        System.out.println("<<<<<<<<<<<<<<<선생님꺼>>>>>>>>>>>>>>>");

        for(int i = 0; i < n; i++){
            System.out.print(i +10);
            if(i < n-1) {
                System.out.print(", ");
            }
        }
        System.out.println();
        for(int i = 0; i < n; i++){
            System.out.print(n-i);
            if(i < n-1) {
                System.out.print(", ");
            }
        }
        System.out.println();
        for(int i = 0; i < n; i++){
            System.out.print(n-i +10);
            if(i < n-1) {
                System.out.print(", ");
            }
        }


    }
}

 

구구단

public class Loop2 {

    public static void main(String[] args) {
        /*
         [2단]
         2x1 =2
         2x2 =4
         2x3 =6
         ...
         2x9 = 18
         */

        int dan = 2;

        for(int k =0; dan<10; dan++){
            System.out.println("["+dan+"단]");
            for( int i = 0; i <9; i++){
                int num = i + 1;
                System.out.println( dan +"x"+ num + "=" + (dan * num));
            }
        }
    }
}

 

public static void main(String[] args) {

        for(int dan =0; dan<10; dan++) {
            System.out.println("[" + dan + "단]");
            for (int i = 0; i < 9; i++) {
                int num = i + 1;
                System.out.println(dan + "x" + num + "=" + (dan * num));
            }
        }

        }
}