[BACKJOON/JAVA] 단계별로 풀어보기 1단계

백준 단계별로 풀어보기 1단계 [입출력과 사칙연산]

• 단계 : 1-1
• 문제 : #2557
• 문제 제목 : Hello World

public class Main {
	public static void main(String[] args) {
	   System.out.println("Hello World!");
	}
}

• 단계 : 1-2
• 문제 : #1000
• 문제 제목 : A+B

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

  	    int A = in.nextInt();
        int B = in.nextInt();
        System.out.println(A+B);
           
        in.close();
	}
}

• 단계 : 1-3
• 문제 : #1001
• 문제 제목 : A-B

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
            Scanner in = new Scanner(System.in);

  	        int A = in.nextInt();
            int B = in.nextInt();
            System.out.println(A-B);
           
            in.close();
	}
}

• 단계 : 1-4
• 문제 : #10998
• 문제 제목 : AxB

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        
        int a = in.nextInt();
        int b = in.nextInt();
        
        System.out.println(a*b);
        
        in.close();
        
    }
}

• 단계 : 1-5
• 문제 : #1008
• 문제 제목 : A/B

import java.util.Scanner;

public class Main{

public static void main(String[] args){
    Scanner in = new Scanner(System.in);

    double a = in.nextDouble();
    double b = in.nextDouble();

    System.out.println(a/b);

    in.close();
	}
}

• 단계 : 1-6
• 문제 : #10869
• 문제 제목 : 사칙연산

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {

		int a, b;
		Scanner scan = new Scanner(System.in);
		a = scan.nextInt();
		b = scan.nextInt();
		
		System.out.println(a+b);
		System.out.println(a-b);
		System.out.println(a*b);
		System.out.println(a/b);
		System.out.println(a%b);
	}
}

• 단계 : 1-7
• 문제 : #10926
• 문제 제목 : ??!

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
            String str = in.nextLine();
		   System.out.println(str+"??!");
           
            in.close();
	}
}

• 단계 : 1-8
• 문제 : #18108
• 문제 제목 : 1998년생인 내가 태국에서는 2541년생?!

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
            int str = in.nextInt();
            System.out.println(str-543);
			
            in.close();
	}
}

• 단계 : 1-9
• 문제 : #10430
• 문제 제목 : 나머지

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
			int a = in.nextInt();
			int b = in.nextInt();
			int c = in.nextInt();
			
			System.out.println((a+b)%c);
			System.out.println(((a%c)+(b%c))%c);
			System.out.println((a*b)%c);
			System.out.println(((a%c)*(b%c))%c);
         
            in.close();
	}
}

• 단계 : 1-10
• 문제 : #2588
• 문제 제목 : 곱셈

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
			int a = in.nextInt();
			int b = in.nextInt();
			
			System.out.println( a * (b%10));
			System.out.println( a *( b%100/10));
			System.out.println( a * (b/100));
			System.out.println( a * b);
            in.close();
	}
}

• 단계 : 1-11
• 문제 : #11382
• 문제 제목 : 꼬마 정민

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
            Scanner in = new Scanner(System.in);
			long a = in.nextLong();
			long b = in.nextLong();
			long c = in.nextLong();

            System.out.println(a + b + c);
            in.close();
	}
}

• 단계 : 1-12
• 문제 : #10171
• 문제 제목 : 고양이

public class Main {
	public static void main(String[] args) {
	   System.out.println("\\    /\\");
	   System.out.println(" )  ( ')");
	   System.out.println("(  /  )");
	   System.out.println(" \\(__)|");
 
	}
}

• 단계 : 1-13
• 문제 : #10172
• 문제 제목 : 개

public class Main{
    
    public static void main(String[] args){
        System.out.println("|\\_/|");
        System.out.println("|q p|   /}");
        System.out.println("( 0 )\"\"\"\\");
        System.out.println("|\"^\"`    |");
        System.out.println("||_/=\\\\__|");
    }
}