Day2 - 01

import java.util.Scanner;

public class If1 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("나이를 입력하세요");
        int age = sc.nextInt();

        if(age>19) {                                //중괄호 있을 때 전체 적용 중괄호 없을 때 ;까지적용
            System.out.println("성인입니다");

            System.out.println("당신의 나이:" + age);
        }
    }
}

import java.util.Scanner;

public class If2 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("나이를 입력하세요");
        int age = sc.nextInt();
        if(age >19) System.out.println("성인입니다");
        else System.out.println("미성년입니다");
        System.out.println("당신의 나이: " +age);
    }
}

import java.util.Scanner;

public class If3 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("나이를 입력하세요");
        int age = sc.nextInt();
        if(age>19){
            System.out.println("성인입니다");

        } else if (age>14) {
            System.out.println("청소년입니다");
        }else if(age >6){
            System.out.println("어린이입니다");
        }else {
            System.out.println("유아입니다");
        }
        System.out.println("당신의 나이:" +age);
    }
}

import java.util.Scanner;

public class If4 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("혈액형을 입력하세요");
        String blood= sc.next();
//        System.out.println(blood);

        System.out.println("RH+, RH- 중 입력하세요");
        String rh =sc.next();
//        System.out.println(rh);

        if(blood.equals("O")){
            if(rh.equals("RH+")){
                System.out.println("RH+ O형입니다");
            }
            if(rh.equals("RH-")){
                System.out.println("RH- O형입니다");
            }
        }
        if(blood.equals("B")){
            if(rh.equals("RH+")){
                System.out.println("RH+ B형입니다");
            }
            if(rh.equals("RH-")){
                System.out.println("RH- B형입니다");
            }
        }
        if(blood.equals("A")){
            if(rh.equals("RH+")){
                System.out.println("RH+ A형입니다");
            }
            if(rh.equals("RH-")){
                System.out.println("RH- A형입니다");
            }
        }
        if(blood.equals("AB")){
            if(rh.equals("RH+")){
                System.out.println("RH+ AB형입니다");
            }
            if(rh.equals("RH-")){
                System.out.println("RH- AB형입니다");
            }
        }
            }
        }