[JAVA] 단계별로 풀어보기 2. if문

 

1. BOJ1330 두 수 비교하기

https://www.acmicpc.net/problem/1330

1330번: 두 수 비교하기

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main{
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[]str = br.readLine().split(" ");        
        short a = Short.parseShort(str[0]);
        short b = Short.parseShort(str[1]);
        
        if(a>b)
            System.out.println(">");
        else if(a<b)
            System.out.println("<");
        else
            System.out.println("==");
    }
}

 

2. BOJ9498 시험성적

https://www.acmicpc.net/problem/9498

9498번: 시험 성적

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        byte score = Byte.parseByte(br.readLine());
        
        byte ret = (byte)(score/10);
        switch (ret) {
            case 10 : System.out.println("A"); break;
            case 9 : System.out.println("A"); break;
            case 8 : System.out.println("B"); break;
            case 7 : System.out.println("C"); break;
            case 6 : System.out.println("D"); break;
            default : System.out.println("F"); break;
        }
    }
}

 

3. BOJ2753 윤년

https://www.acmicpc.net/problem/2753

2753번: 윤년

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main{
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        short year = Short.parseShort(br.readLine());
        
        if(year%400 == 0)
            System.out.println("1");
        else if(year%100!=0 &&year%4==0)
            System.out.println("1");
        else 
            System.out.println("0");
        
    }
}

 

4. BOJ14681 Quadrant Selection

https://www.acmicpc.net/problem/14681

14681번: 사분면 고르기

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main{
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        Short x = Short.parseShort(br.readLine());
        Short y = Short.parseShort(br.readLine());
        
        if(x>0) {
            if(y>0)
                System.out.println("1");
            else
                System.out.println("4");
        } else if(x<0){
            if(y>0)
                System.out.println("2");
            else
                System.out.println("3");            
        }
    }
}import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main{
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        Short x = Short.parseShort(br.readLine());
        Short y = Short.parseShort(br.readLine());
        
        if(x>0) {
            if(y>0)
                System.out.println("1");
            else
                System.out.println("4");
        } else if(x<0){
            if(y>0)
                System.out.println("2");
            else
                System.out.println("3");            
        }
    }
}

 

5. BOJ2884 SPAVANAC 

https://www.acmicpc.net/problem/2884

2884번: 알람 시계

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

public class Main{
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] time = br.readLine().split(" ");
        int h = Integer.parseInt(time[0]);
        int m = Integer.parseInt(time[1]);
        
        if(m>=45) 
            System.out.println(h + " " + (m-45));
         else
            System.out.println((h+24-1)%24 + " " + (m+60-45));
    }
}