자바과제

2018. 05.02 까지 프린트 후 제출.

과제1. 

import java.util.Scanner;
/*
과제1.별찍기

 */
public class Homework_01 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.println("별찍기 몇단?");
        int num = sc.nextInt();
        int i,j;
        for(i=0; i<num;i++){
            for(j=i; j>=0; j--){
                System.out.print("*");
            }
            System.out.println();
        }

    }
}

과제2.

import java.util.Scanner;

public class Homework_02 {
    public static void main(String[] args) {
        Scanner sc= new Scanner(System.in);
        System.out.println("입장료: 님몇 살?");
        int age=sc.nextInt();
        if(age>=65){
            System.out.println("10,000won");
        }else if(age>=13){
            System.out.println("20,000won");
        }else if(age>=6){
            System.out.println("8,000won");
        }else{
            System.out.println("5,000won");
        }
    }
}

과제3.

import java.util.Scanner;

public class Homework_03 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int tot=0;

        do{
            int pay =sc.nextInt();
            tot+=pay;
        }while(tot<=100000);

        if(tot>100000)
        System.out.println("100,000 초과 "+tot);
    sc.close();
    }
}

과제4.

import java.util.Scanner;

public class Homework_04 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        System.out.println("영어 대소문자 입력후 변환");
        String ch = sc.nextLine();

        for(int i=0; i<ch.length();i++){
            char cha=ch.charAt(i);
            if(cha>='a' && cha<='z'){
                cha=(char)(cha-32);
                System.out.println(cha);
            } else if(cha>='A' && cha<='Z'){
                cha=(char)(cha+32);
                System.out.println(cha);
            }

        }


    }
}