[자바] 정올 150 ~ 159 : 배열1 - 형성평가 1 ~ 10

형성평가1

 

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] arr = new char[10];
        for(int i =0; i < 10; i++) arr[i] = sc.next().charAt(0);

        for(int i = arr.length-1; i>=0; i--) System.out.print(arr[i] + " ");
    }
}

형성평가2

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[5];
        for(int i = 0; i < 5; i++) arr[i] = sc.nextInt();
        System.out.println(arr[0]+arr[2]+arr[4]);
    }
}

형성평가3

 

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[10];
        int even = 0, odd = 0;
        for (int i = 0; i < 10; i++) arr[i] = sc.nextInt();
        for (int i = 0; i < arr.length; i++) {
            if((i+1) % 2 == 0) even += arr[i];
            else odd += arr[i];
        }
        System.out.println("odd : " + odd);
        System.out.println("even : " + even);
    }
}

형성평가4

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[100];
        int temp, last_index = 0;
        for(int i = 0; i < 100; i++){
            temp = sc.nextInt();
            if(temp == -1) break;
            arr[i] = temp;
            last_index++;
        }
        if(last_index > 2){
            for(int i = last_index - 3; i < last_index; i++) System.out.print(arr[i] + " ");
        }else{
            for(int i = 0; i < last_index; i++) System.out.print(arr[i] + " ");
        }

    }
}

형성평가5

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double[] arr = new double[6];
        for(int i = 0; i < 6; i++) arr[i] = sc.nextDouble();
        double sum = 0;
        for(int i = 0; i < 6; i++) sum += arr[i];
        System.out.printf("%.1f", sum/6);
    }
}

형성평가6

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        char[] arr =  {'J', 'U', 'N', 'G', 'O', 'L'};
        int i;
        char ch = sc.next().charAt(0);
        boolean a = true;
        for(i = 0; i < 6; i++){
            if(arr[i] == ch){
                a = false;
                break;
            }
        }

        if(a) System.out.println("none");
        else System.out.println(i);

    }
}

형성평가7

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[100];
        int i, a;
        for(i = 0; i < 100; i++){
            a = sc.nextInt();
            if(a == 999) break;
            arr[i] = a;
        }
        int min = 999999;
        int max = -999999;
        for(int j = 0; j < i; j++){
            min = arr[j] > min ? min : arr[j];
            max = arr[j] < max ? max : arr[j];
        }
        System.out.println("max : " + max);
        System.out.println("min : " + min);
    }
}

형성평가8

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int i,a, count = 0;
        double sum = 0.0;
        int[] arr= new int[100];
        for(i = 0; i < 100; i++){
            a = sc.nextInt();
            if(a == 0) break;
            arr[i] = a;
        }

        for(int j = 0; j < i; j++){
            if(arr[j]%5 == 0) {
                sum += arr[j];
                count++;
            }
        }//end for
        System.out.println("Multiples of 5 : " + count);
        System.out.println("sum : " + (int)sum);
        System.out.printf("avg : %.1f", sum/count);
    }//end main
}

형성평가9

 

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[100];
        int i,a;
        for(i = 0; i < 100; i++){
            a = sc.nextInt();
            if(a == 0) break;
            arr[i] = a;
        }

        System.out.println(i);
        for(int j = 0; j < i; j++){
            if(arr[j] % 2 == 0) System.out.print((arr[j]/2) + " ");
            else System.out.print((arr[j]*2) + " ");
        }
    }
}

형성평가10

import java.util.Arrays;
import java.util.Collections;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        Integer[] arr = new Integer[n];
        for(int i = 0; i < n; i++) arr[i] = sc.nextInt();
        Arrays.sort(arr, Collections.reverseOrder());
        for(int i = 0; i < n; i++) System.out.println(arr[i]);
    }
}