TILAlgorithm & Quiz

백준 TEST03_for문 사용해보기

BAEKJOON, JAVA, algorithm, coding, develop

baekjoon_java

백준_TEST03_for문 사용해보기

N찍기

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import java.util.*;
class TEST03_01{
	public TEST03_01(){
		Scanner scan = new Scanner(System.in);

		System.out.print("N값 입력 : ");
		int N = scan.nextInt();

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

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_01 test03_01 = new TEST03_01();
	}
}

기찍 N

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import java.util.*;
class TEST03_02{
	public TEST03_02(){
		Scanner scan = new Scanner(System.in);

		System.out.print("N값 입력 : ");
		int N = scan.nextInt();

		for(int i=N;i>=1;i--){
			System.out.println(i);
		}
	}
}

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_02 test03_02 = new TEST03_02();
	}
}

구구단

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import java.util.*;

class TEST03_03{
	public TEST03_03(){
		Scanner scan = new Scanner(System.in);

		System.out.print("N값 입력 : ");
		int N = scan.nextInt();

		for(int i=1;i<=9;i++){
			System.out.println(N+" * "+i+" = "+N*i);
		}
	}
}

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_03 test03_03 = new TEST03_03();
	}
}

별찍기-1

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import java.util.*;
class TEST03_04{
	public TEST03_04(){
		Scanner scan = new Scanner(System.in);

		System.out.print("N값 입력 : ");
		int N = scan.nextInt();

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

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_04 test03_04 = new TEST03_04();
	}
}

별찍기-2

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import java.util.*;
class TEST03_05{
	public TEST03_05(){
		Scanner scan = new Scanner(System.in);

		System.out.print("N값 입력 : ");
		int N = scan.nextInt();
	//	int K = N-1;

		for(int i=1;i<=N;i++){
		/*
			for(int x=K;x>=1;x--){
				System.out.print(" ");
			}
		*/
			for(int j=1;j<=N-i;j++){
			 System.out.print(" ") ;
			}

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

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_05 test03_05 = new TEST03_05();
	}
}

별찍기-3

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import java.util.*;

class TEST03_06{
	public TEST03_06(){
		Scanner scan = new Scanner(System.in);

		System.out.print("N값 입력 : ");
		int N = scan.nextInt();

		for(int i=1;i<=N;i++){

			for(int j=N-i+1;j>=1;j--){
				System.out.print("*");
			}

			System.out.println("");
		}
	}
}

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_06 test03_06 = new TEST03_06();
	}
}

별찍기-4

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import java.util.*;
class TEST03_07{
	public TEST03_07(){
		Scanner scan = new Scanner(System.in);

		System.out.print("N값 입력 : ");
		int N = scan.nextInt();

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

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_07 test03_07 = new TEST03_07();
	}
}

###2007년

-> 해결은 하였으나 더 간단하게 푸는 방법이 존재함.

-> 1번=직접 해결한 소스. 2번=해답 소스

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//1번
import java.util.*;
class TEST03_08{
	public TEST03_08(){
		Scanner scan = new Scanner(System.in);
		int x,y,z = 0;	//z는 일주일 7을 의미.

		while(true){
			x = scan.nextInt();
			if(x>=1 && x<=12){ break; }
		}

		while(true){
			y = scan.nextInt();
			if(y>=1 && y<=31){ break; }
		}
		// x = 월, y = 일을 입력받는다.

		//ArrayList<String> month = new ArrayList<>();
		//month.add("SUN");month.add("MON");
		//한개씩은 위처럼 한번에는 아래처럼 이용. Array.asList
		ArrayList<String> week = new ArrayList<>(Arrays.asList("MON", "TUE", "WED", "THU", "FRI", "SAT","SUN"));

		for(int i=1;i<=12;i++){
				if(i==1 || i==3 || i==5|| i==7 || i==8 || i==10 || i==12){
					for(int j=1;j<=31;j++){
					if(i==x && j==y){
						System.out.println(week.get(z).toString());
						}
					z++;
					if(z==7){
						z = 0;
						}
					} // 1,3,5,7,8,10,11,12 월 for문 end
				}
				else if(i==2){
					for(int j=1;j<=28;j++){
						if(i==x && j==y){
							System.out.println(week.get(z).toString());
							}
						z++;
						if(z==7){
							z = 0;
							}
						} // 2월 for문 end
					}
				else{
					for(int j=1;j<=30;j++){
						if(i==x && j==y){
							System.out.println(week.get(z).toString());
							}
						z++;
						if(z==7){
							z = 0;
							}
						} // 4,6,9,11 월 for문 end
					} // if end
			}//for-i end
		}
	}

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_08 test03_08 = new TEST03_08();
	}
}
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//2번 - 해답
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int month = sc.nextInt();
        int day = sc.nextInt();
        sc.close();

        int[] daysInMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
        String[] dayOfTheWeeks = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};

        int totalDays = day;
        for (int i = 0; i < month - 1; ++i) {
            totalDays += daysInMonth[i];
        }

        System.out.println(dayOfTheWeeks[totalDays % 7]);
    }
}

합

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import java.util.*;
class TEST03_09{
	public TEST03_09(){
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		int sum = 0;

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

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_09 test03_09 = new TEST03_09();
	}
}

숫자의 합 <미해결>

-> 미해결한 이유 : Scanner 메서드로는 숫자를 1개씩 입력 받는건 불가능하다.

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import java.util.*;
class TEST03_10_1{
	public TEST03_10_1(){
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		int a = 0;
		int sum = 0;
		ArrayList<Integer> array = new ArrayList<>();

		for(int i=1;i<=n;i++){
			a = scan.nextInt();
			array.add(a);
		}

		for(int i=1;i<=n;i++){
			sum += array.get(i-1);
		}
		System.out.println(sum);
	}
}
public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_10_1 test03_10_1 = new TEST03_10_1();
	}
}

숫자의 합 <해결>

-> 해결법 : 문자열로 받아서 끊어서 하나하나 더하거나 아스키코드를 이용한다.

-> 여기서는 끊어서 사용하는 substring() 함수를 이용.

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import java.util.*;
class TEST03_10_2{
	public TEST03_10_2(){
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		String a = scan.next();
		scan.close();
		int sum = 0;

		for(int i=0;i<n;i++){
			sum += Integer.parseInt(a.substring(i, i + 1));
		}
		//Integer.parseInt() 인트형으로 형변환 메서드
		//substring(a,b); a=현재위치 b=까지
		System.out.println(sum);
	}
}

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_10_2 test03_10_2 = new TEST03_10_2();
	}
}

열 개씩 끊어 출력하기

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import java.util.*;
class TEST03_11{
	public TEST03_11(){
		Scanner scan = new Scanner(System.in);
		String n = scan.next();
		scan.close();

		for(int i=1;i<=n.length();i++){
			System.out.print(n.charAt(i-1));
			if(i%10==0){
				System.out.println("");
			}
		}
	}
}

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_11 test03_11 = new TEST03_11();
	}
}

빠른 A+B (BufferedReader , BufferedWriter)

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import java.util.*;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

class TEST03_12{
	public TEST03_12() throws IOException{
		//버퍼드리더와 버퍼드라이터를 쓰기 위한 조건 : throws NumberFormatException, IOException
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));//선언

		int test_case = Integer.parseInt(br.readLine()); // 몇개 입력?
		//readline은 버퍼에 입력하는것.

		for(int i=0; i<test_case;i++) { //ex) 5개라 입력했으면 총 5줄의 입력을 받음.
			String a[] = br.readLine().split(" ");//입력과 동시에 " "공백을 구분하여 배열을 나눈다.
			bw.write("현재 입려숫자는 각각"+a[0]+" "+a[1]+"\n");

			int answer = Integer.parseInt(a[0]) + Integer.parseInt(a[1]);
			bw.write(answer+"\n");
			// write는 버퍼에 해당 값을 저장하는것.
			// flush는 버퍼에 있는 내용을 printf하는것이다.
			// 여기서 한번 flush를 해버리면 버퍼의 내용을 출력과 동시에 비운다.
		}
		bw.flush();
		bw.close();
	}
}

public class TEST03 {
	public static void main(String[] args) throws IOException {
	// import java.util.*;
	//	Scanner scan = new Scanner(System.in);
		TEST03_12 test03_12 = new TEST03_12();
	}
}



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