[자바] 정올 160 ~ 169 : 배열2 - 형성평가1 ~ 10

형성평가1

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int val;
        int[] count = new int[7];
        for(int i = 0; i < 10; i++){
            val =  sc.nextInt();
            count[val] += 1;
        }
        for(int i = 1; i < 7; i++) System.out.println(i + " : " + count[i]);
    }
}

형성평가2

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n =1;
        int[] people = new int[11];
        int index;
        while(true){
            n = sc.nextInt();
            if(n == 0)break;
            index = n/10;
            people[index]++;
        }//end while
        for(int i = people.length-1; i >= 0; i--){
            if(people[i] != 0) System.out.println((i*10) + " : " + people[i] + " person");
        }
    }
}

형성평가3

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt(), b = sc.nextInt();
        int[] arr = new int[10];
        arr[0] = a;arr[1] = b;
        for(int i = 2; i < arr.length; i ++){
            if(arr[i-2] + arr[i-1] < 10){
                arr[i] = arr[i-2] + arr[i-1];
            }else{
                int n = arr[i-2] + arr[i-1];
                n %= 10;
                arr[i] = n;
            }

        }
        for(int i = 0; i < arr.length; i ++) System.out.print(arr[i] + " ");
    }
}

형성평가4

 

public class Main {
    public static void main(String[] args) {
        int[][] arr = {{3, 5, 9}, {2, 11, 5}, {8, 30, 10}, {22, 5, 1}};
        int sum = 0;
        for(int i = 0; i < arr.length; i++){
            for(int j = 0; j < arr[i].length; j++){
                System.out.print(arr[i][j] + " ");
                sum += arr[i][j];
            }
            System.out.println();
        }
        System.out.println(sum);
    }
}

형성평가5

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[][] arr = new int[4][3];

        for(int i = 0; i<arr.length; i++){
            System.out.print((i+1)+"class? ");
            for(int j = 0; j<arr[i].length; j++){
                arr[i][j] = sc.nextInt();
            }
        }//end for
        int sum = 0;
        for(int i = 0; i<arr.length; i++){
            System.out.print((i+1)+"class : ");
            for(int j = 0; j<arr[i].length; j++){
                sum+=arr[i][j];
            }
            System.out.println(sum);
            sum = 0;
        }//end for

    }//end main

}

형성평가6

public class Main {
    public static void main(String[] args) {
        int[][] arr = new int[5][5];
        arr[0][0] = 1; arr[0][2] = 1; arr[0][4] =1;

        for(int i = 1; i < arr.length; i++){
            for(int j = 0; j < arr[i].length; j++){
                if(j-1 < 0) arr[i][j] = arr[i-1][j+1];
                else if(j+1 > arr[i].length-1) arr[i][j] = arr[i-1][j-1];
                else arr[i][j] = arr[i-1][j-1] + arr[i-1][j+1];
            }
        }

        for(int i = 0; i < arr.length; i++){
            for(int j = 0; j < arr[i].length; j++){
                System.out.print(arr[i][j] + " ");
            }
            System.out.println();
        }

    }
}

형성평가7

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[][] fa = new int[2][3];
        int[][] sa = new int[2][3];
        System.out.println("first array");

        for(int i = 0; i < fa.length; i++){
            for(int j = 0; j < fa[i].length; j++){
                fa[i][j] = sc.nextInt();
            }
            sc.nextLine();
        }
        System.out.println("second array");
        for(int i = 0; i < sa.length; i++){
            for(int j = 0; j < sa[i].length; j++){
                sa[i][j] = sc.nextInt();
            }
        }

        for(int i = 0; i < sa.length; i++){
            for(int j = 0; j < sa[i].length; j++){
                System.out.print((fa[i][j] * sa[i][j]) + " ");
            }
            System.out.println();
        }
    }

}

형성평가8

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[][] arr = new int[4][2];
        for(int i =0; i<4;i++){
            for(int j = 0; j < 2; j++){
                arr[i][j] = sc.nextInt();
            }
        }

        int[] row = new int[4];
        int[] col = new int[2];
        int sum = 0;

        for(int i =0; i<4;i++){
            for(int j = 0; j < 2; j++) {
                col[j] += arr[i][j];
                row[i] += arr[i][j];
                sum += arr[i][j];
            }
        }

        for(int i : row) System.out.print((i/2) + " ");
        System.out.println();
        for(int i : col) System.out.print((i/4) + " ");
        System.out.println();
        System.out.println(sum/8);



    }
}

형성평가9

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[][] arr = new int[10][10];
        for(int i = 0; i < 10; i++) arr[i][0] = 1;
        for(int i = 1; i < 10; i++){
            for(int j = 1; j < 10; j++){
                arr[i][j] = arr[i-1][j-1] + arr[i-1][j];
            }
        }
        int n = sc.nextInt();

        for(int i = n-1; i >= 0; i--){
            for(int j = 0; j < 10; j++){
                if(arr[i][j] != 0) System.out.print(arr[i][j] + " ");
            }
            System.out.println();
        }
    }
}

형성평가10

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[][] arr = new char[3][5];
        for(int i = 0; i < 3; i++){
            for(int j = 0; j < 5; j++){
                arr[i][j] = sc.next().charAt(0);
            }
        }

        for(int i = 0; i < 3; i++) {
            for (int j = 0; j < 5; j++) {
                System.out.print(Character.toLowerCase(arr[i][j]) + " ");
            }
            System.out.println();
        }


    }
}