[알고리즘] for문 사용해보기

2741번 : N 찍기

import java.util.Scanner;
 
public class java2741 {
 
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num = scan.nextInt();
        
        for(int i=1;i<num+1;i++) {
            System.out.println(i);
        }
 
    }
 
}
 

2742번 : 기 찍 N

import java.util.Scanner;
 
public class java2742 {
 
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int num = scan.nextInt();
        
        for(int i=num; i>0;i--) {
            System.out.println(i);
        }
    }
}
 

2739 : 구구단

import java.util.Scanner;
 
public class java2739 {
 
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        
        int num = scan.nextInt();
        
        for(int i=1;i<10;i++) {
            System.out.println(num+" * "+i+" = "+num*i);
        }
 
    }
 
}
 

2438 : 별찍기

import java.util.Scanner;
 
public class java2438 {
 
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        
        int num = scan.nextInt();
        
        for(int i=0;i<num;i++) {
            for(int j=0;j<i+1;j++) {
                System.out.print("*");
            }
            System.out.print("\n");
        }
    }
}