[JAVA]15.구구단 스캐너

package ex03;

//    (구구단 스캐너)

//1)절차를 나눈다
//2)스캐너를 사용해서 번호를 받는다.
//3)받은번호를 사용하여 구구단 하나를 출력해본다.
//4)하드코딩해서 구구단 한줄을 만든다
//5)공통모듈을 만든다
//6)불필요한것을 반복문으로 올린다.

package ex03;

import java.util.Scanner;

public class pra01 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("구구단 숫자 입력");
        int n = sc.nextInt();
        
    }
}

package ex03;

import java.util.Scanner;

public class pra01 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("구구단 숫자 입력");
        int n = sc.nextInt();
        
        System.out.println(n + "*" + "1" + "=" + (n * 1));
    
    }
}          

package ex03;

import java.util.Scanner;

public class pra01 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("구구단 숫자 입력");
        int n = sc.nextInt();
        
        System.out.println(n + "*" + "1" + "=" + (n * 1));
        System.out.println(n + "*" + "2" + "=" + (n * 2));
        System.out.println(n + "*" + "3" + "=" + (n * 3));
        System.out.println(n + "*" + "4" + "=" + (n * 4));
        System.out.println(n + "*" + "5" + "=" + (n * 5));
        System.out.println(n + "*" + "6" + "=" + (n * 6));
        System.out.println(n + "*" + "7" + "=" + (n * 7));
        System.out.println(n + "*" + "8" + "=" + (n * 8));
        System.out.println(n + "*" + "9" + "=" + (n * 9));
    
    }
}        

package ex03;

import java.util.Scanner;

public class pra01 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("구구단 숫자 입력");
        int n = sc.nextInt();
        
        int m = 0;

        m++;
        System.out.println(n + "*" + m + "=" + (n * m));
        m++;
        System.out.println(n + "*" + m + "=" + (n * m));
        m++;
        System.out.println(n + "*" + m + "=" + (n * m));
        m++;
        System.out.println(n + "*" + m + "=" + (n * m));
        m++;
        System.out.println(n + "*" + m + "=" + (n * m));
        m++;
        System.out.println(n + "*" + m + "=" + (n * m));
        m++;
        System.out.println(n + "*" + m + "=" + (n * m));
        m++;
        System.out.println(n + "*" + m + "=" + (n * m));
        m++;
        System.out.println(n + "*" + m + "=" + (n * m));

1. 불필요한 것을 반복문으로 올린다:

package ex03;

import java.util.Scanner;

public class pra01 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("구구단 숫자 입력");
        int n = sc.nextInt();

        for (int i = 1; i < 10; i++) {
            System.out.println(n + "*" + i + "=" + (n * i));
        }