Java - For문 백준 예제 풀기

자바 For문 예제 풀기

오늘은 백준 이라는 곳에서 For문 예제 풀기를 해보자
문제 출처는 아래의 링크를 참고하였습니다.

https://www.acmicpc.net/step/3

1번 - 구구단

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();

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

	

	}
}

2번 - A+B

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();

		for (int i = 0; i < x; i++) {
			int y = sc.nextInt();
			int z = sc.nextInt();

			System.out.println(y + z);
		}

	}
}

3번 - 합

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int sum = 0;
		for (int i = 1; i <= x; i++) {
			sum += i;

		}
		System.out.println(sum);

	}
}

5번 - 자연수 찍기

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();

		for (int i = 1; i <= x; i++) {
			System.out.println(i);

		}

	}
}

6번 - 기찍 N

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();

		for (int i = 0; i < x; i++) {
			System.out.println(x - i);

		}

	}
}

7번 - A + B

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();

		for (int i = 0; i < x; i++) {
			int y = sc.nextInt();
			int z = sc.nextInt();

			System.out.println("Case #" + (i + 1) + ": " + (y + z));
		}

	}

}

8번 - A + B

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();

		for (int i = 0; i < x; i++) {
			int y = sc.nextInt();
			int z = sc.nextInt();

			System.out.println("Case #" + (i + 1) + ": " + y + " + " + z + " = " + (y + z));
		}

	}

}

9번 - 별 찍기

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();

		for (int i = 1; i < x + 1; i++) {
			for (int j = 0; j < i; j++) {
				System.out.print("*");
			}
			System.out.println();
		}

	}

}

10번 - 별 찍기

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();

		for (int i = 0; i < x ; i++) {
			for (int j = 0; j < x - i - 1; j++) {
				System.out.print(" ");
			}
			for (int z = 0; z < i+1; z++) {
				System.out.print("*");
			}
			System.out.println();
		}

	}

}