[자바] 정올 175 ~ 181 : 함수2 - 형성평가1~7

형성평가1 : 175

import java.util.*;
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<arr.length;i++) arr[i] = sc.nextInt();
        sort_pr(arr);
    }
    public static void sort_pr(Integer[] arr){
        Arrays.sort(arr, Collections.reverseOrder());
        for(int i = 0;i<arr.length;i++) System.out.print(arr[i] + " ");
    }
}

형성평가2 : 176

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double a = sc.nextDouble(), b = sc.nextDouble();
        count_int(a, b);
    }
    public static void count_int(double a, double b){
        int count =0;
        int max = (int)Math.sqrt(a > b ? a:b);
        int min = (int)Math.ceil(Math.sqrt(a < b ? a :b));
        for(double i = min; i <= max; i++){
            count++;
        }
        System.out.println(count);
    }
}

형성평가3 : 177

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 < arr.length; i++) arr[i] = sc.nextInt();
        addAll(arr);
    }
    public static void addAll(int[] arr){
        int sum = 0;
        for(int i = 0; i < arr.length; i++) sum += Math.abs(arr[i]);
        System.out.println(sum);
    }

}

형성평가4 : 178

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        solution(n);
    }
    public static void solution(int a){
        System.out.println((int)Math.pow(2, a));
    }
}

형성평가5 : 179

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double[] arr = new double[3];
        for(int i = 0; i < arr.length; i++)arr[i] = sc.nextDouble();
        solution(arr);
    }
    public static void solution(double[] arr){
        double sum = 0.0;
        int sum_i = 0;
        for(int i = 0; i < arr.length; i++){
            sum += arr[i];
            sum_i += (int)Math.round(arr[i]);
        }
        System.out.println(Math.round(sum/arr.length));
        System.out.println(Math.round((double)sum_i/arr.length));
    }
}

형성평가6 : 180

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] arr = new int[7];
        for(int i = 0; i < arr.length; i++) arr[i] = sc.nextInt();
        bubble_sort(arr);
    }
    public static void bubble_sort(int[] arr){

        for(int i = 0; i < 3;i++){
            for(int j = 0; j < arr.length-1; j++){
                if(arr[j]>arr[j+1]){
                    int temp = arr[j];
                    arr[j] = arr[j+1];
                    arr[j+1] = temp;
                }
            }
            }
        for(int k=0;k<arr.length;k++){
            System.out.print(arr[k] + " ");
        }
    }
}

형성평가7 : 181

import java.util.Scanner;
public class Main {
    public static final double pi = 3.141592;
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("radius : ");
        double r = sc.nextDouble();
        area(r);
    }
    public static void area(double r){
        System.out.printf("area = %.3f", r*r*pi);
    }
}