JX405기_비트/Java

Day01-1 별 찍기 JAVA Coding

_하루살이_ 2023. 1. 9. 20:51

1번문제 코드리뷰(강사님이 해주신 답)

package Day01;

import java.util.Scanner;

public class StarPrinter01 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 1번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();
        for(int i = 1; i <= lineNumber; i++){
            for(int j = 1; j <= i; j++){
                System.out.print('*');
            }
            System.out.println();
        }
        scanner.close();
    }

}

2번 문제 코드리뷰(강사님이 해주신 답)

package Day01;

import java.util.Scanner;

public class StarPrinter02 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 2번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();
        for(int i = 1; i <= lineNumber; i++){
            String stars = "";
            for(int j = i; j <= lineNumber; j++){
                stars += "*";
            }
            System.out.println(stars);
        }
        scanner.close();
    }
}

3번 문제 코드리뷰(강사님이 해주신 답)

package Day01;

import java.util.Scanner;

public class StarPrinter03 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 3번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();
        for(int i = 1; i <= lineNumber; i++){
            String stars = "";
            for(int j = 1; j <= lineNumber; j++){
                if (j <= lineNumber - i) {
                    stars += " ";
                }
                else {
                    stars += "*";
                }
            }
            System.out.println(stars);
        }
        scanner.close();
    }
}

4번 문제 코드리뷰(내가 혼자 풀어본 답)

package Day01;

import java.util.Scanner;

public class StarPrinter04 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 4번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();
        for(int i = lineNumber; i >= 1; i--){
            String stars = "";
            for(int j = 1; j <= lineNumber; j++){
                if (j <= lineNumber - i) {
                    stars += " ";
                }
                else {
                    stars += "*";
                }
            }
            System.out.println(stars);
        }
        scanner.close();
    }
}

5번 문제 코드리뷰(강사님이 해주신 답)

package Day01;

import java.util.Scanner;

public class StarPrinter05 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 5번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();
        for(int i = 1; i <= lineNumber; i++){
            String stars = "";

            for(int j = 1; j <= lineNumber - i; j++){
               stars += " ";
            }

            for(int j = 1; j <= i * 2 - 1; j++){
                stars += "*";
            }

            System.out.println(stars);
        }
        scanner.close();
    }
}

6번 문제 코드리뷰(강사님이 해주신 답) 쉬운버전

package Day01;

import java.util.Scanner;

public class StarPrinter06_easy {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 6번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();
        for(int i = lineNumber; i >= 1; i--){
            String stars = "";

            for(int j = 1; j <= lineNumber - i; j++){
                stars += " ";
            }

            for(int j = 1; j <= i * 2 - 1; j++){
                stars += "*";
            }

            System.out.println(stars);
        }
        scanner.close();
    }
}

6번 문제 코드리뷰(강사님이 해주신 답) 어려운버전

package Day01;

import java.util.Scanner;

public class StarPrinter06_hard {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 6번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();
        for(int i = 1; i <= lineNumber; i++){
            String stars = "";
            for(int j = 1; j <= i - 1; j++){
                stars += " ";
            }

            // -2 * i + (2 * lineNumber + 1)
            // = 2 * (lineNumber - i) + 1
            for(int j = 1; j <= 2 * (lineNumber - i) + 1; j++){
                stars += "*";
            }


            System.out.println(stars);
        }
        scanner.close();
    }
}

7번 문제 코드리뷰(내가 혼자 풀어본 답)

package Day01;

import java.util.Scanner;

public class StarPrinter07 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 7번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();

        int totalHeight = 2 * lineNumber - 1;

        for (int i = 1; i <= totalHeight; i++) {
            String stars = "";
            if (i<lineNumber) {
                for (int j = 1; j <= i; j++) {
                    stars += '*';
                }

            }
            else {
                for(int j = 1; j <= i-lineNumber; j++){
                    stars += " ";
                }

                // -2 * i + (2 * lineNumber + 1)
                // = 2 * (lineNumber - i) + 1
                for(int j = 1; j <= 2 * lineNumber - i; j++){
                    stars += "*";
                }

            }
            System.out.println(stars);
        }


        scanner.close();
    }

}

8번 문제 코드리뷰(내가 혼자 풀어본 답)

package Day01;

import java.util.Scanner;

public class StarPrinter08 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 8번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();

        int totalHeight = 2 * lineNumber - 1;

        for (int i = 1; i <= totalHeight; i++) {
            String stars = "";
            int spaceWidth = 0;
            int starWidth = 0;

            if (i < lineNumber) {
                for(int j = 1; j <= lineNumber; j++){
                    if (j <= lineNumber - i) {
                        stars += " ";
                    }
                    else {
                        stars += "*";
                    }
                }

            }
            else {
                int lowerI = i - lineNumber + 1;
                //아랫부분
                spaceWidth = lowerI - 1;
                starWidth = lineNumber - lowerI + 1;
                for(int j = 1; j <= spaceWidth; j++){
                    stars += " ";
                }

                // -2 * i + (2 * lineNumber + 1)
                // = 2 * (lineNumber - i) + 1
                for(int j = 1; j <= starWidth; j++){
                    stars += "*";
                }
            }
            System.out.println(stars);
        }


        scanner.close();
    }
}

9번 문제 코드리뷰(강사님이 해주신 답)

package Day01;

import java.util.Scanner;

public class StarPrinter09 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 9번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();

        int totalHeight = 2 * lineNumber - 1;

        for(int i = 1; i <= totalHeight; i++){
            String stars = "";
            int spaceWidth = 0;
            int starWidth = 0;

            if (i < lineNumber) {
                //윗부분
                spaceWidth = lineNumber - i;
                starWidth = 2 * i -1;
                for(int j = 1; j <= spaceWidth; j++){
                    stars += " ";
                }

                for(int j = 1; j <= starWidth; j++){
                    stars += "*";
                }
            }
            else {
                int lowerI = i - lineNumber + 1;
                //아랫부분
                spaceWidth = lowerI - 1;
                starWidth = 2*(lineNumber - lowerI) + 1;
                for(int j = 1; j <= spaceWidth; j++){
                    stars += " ";
                }

                // -2 * i + (2 * lineNumber + 1)
                // = 2 * (lineNumber - i) + 1
                for(int j = 1; j <= starWidth; j++){
                    stars += "*";
                }
            }

            System.out.println(stars);
        }

        scanner.close();
    }
}

10번 문제 코드리뷰(강사님이 해주신 답)

package Day01;

import java.util.Scanner;

public class StarPrinter10 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("별 찍기 10번");
        System.out.println("출력할 줄 수를 입력해주세요");
        System.out.println("> ");
        int lineNumber = scanner.nextInt();

        int totalHeight = 2 * lineNumber - 1;

        for(int i = 1; i <= totalHeight; i++){
            String stars = "";
            if (i ==1 || i == totalHeight) {
                for(int j = 1; j<= totalHeight; j ++){
                    stars += "*";
                }
            }
            else {
                int starWidth = 0;

                if(i < lineNumber){
                    starWidth = lineNumber - i + 1;
                }

                else {
                    int lowerI = i - lineNumber + 1;
                    starWidth = lowerI;
                }

                int spaceWidth = totalHeight - starWidth * 2;

                for(int j = 1; j <= starWidth; j++){
                    stars += "*";
                }

                for(int j = 1; j <= spaceWidth; j++){
                    stars += " ";
                }

                for (int j = 1; j <= starWidth; j++){
                    stars += "*";
                }
            }

                System.out.println(stars);
            }
        scanner.close();
    }
}

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