[4주차 실습] 3월 23일 Problem Set

1. Take no more than 10 integers and put them in an array, and compute the mean and variance of the integers.

package March23;
import java.util.*;

public class Project1 {

	public static void main(String[] args) {
		System.out.println("10개의 정수를 입력하세요 >>>");
		int[] arr= new int[10];
		int sum=0;
		Scanner input=new Scanner(System.in);
		for(int i=0;i<10;i++) {
			int num=input.nextInt();
			arr[i]=num;
			sum+=arr[i];
		}
		double average=(double)sum/10;
		System.out.printf("10개 정수의 평균은 >>> %f\n", average);
		
		
		double sum2=0;
		for(int i=0;i<10;i++) {
			sum2+=(arr[i]-average)*(arr[i]-average);
		}
		double variance=(double)sum2/10;
		System.out.printf("10개 정수의 분산은 >>> %f\n", variance);
	}

}

 

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2. Take five strings that is separated with commas, place each string in the array, check if each string has a string ”java” and print true/false, and if true, print out a string replaced with ”python”.

package March23;
import java.util.*;

public class Project2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println("다섯 개의 문자열을 쉼표로 구분하여 입력하여라 >>> ");
		Scanner input=new Scanner(System.in);
		String original=input.nextLine();
		String[] arr=original.split(",");
		
		for(int i=0;i<arr.length;i++) {
			if(arr[i].contains("java")) {
				System.out.println("true");
				String rep=arr[i].replace("java", "python");
				System.out.println(rep);
			}
			
			else
				System.out.println("false");
		}
}
}