자바 조건문

Posted on: 2017년 03월 19일 2017년 03월 19일
Categories: 강의자료, 자바

조건문
1. if
  1. if(조건식){
    .. 실행문 ..
    }
2. if-else
  1. if(조건식){
    .. 실행문1 ..
    }
    else{
    .. 실행문2 ..
    }
3. 다중 if-else
  1. if(조건식1){
    .. 실행문1 ..
    }
    else if(조건식2){
    .. 실행문2 ..
    }
    else if(조건식3){
    .. 실행문3 ..
    }
    else{
    .. 실행문4 ..
    }
4. switch-case
  1. switch(식){
    case 값1:
    실행문1;
    break;
    case 값2:
    실행문2;
    break;
    case 값3:
    실행문3;
    break;
    default:
    실행문1;
    }

단순 if

import java.util.Scanner;

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

		System.out.print("나이를 입력하시오:");
		int age = scanner.nextInt();

		if(age < 20) {
			System.out.println("미성년입니다.");
		}
		else{
			System.out.println("성년입니다.");
		}
		scanner.close();
	}
}

import java.util.Scanner;

public class Adult {

public static void main(String[] args) {

Scanner scanner = new Scanner(System.in);

System.out.print("나이를 입력하시오:");

int age = scanner.nextInt();

if(age < 20) {

System.out.println("미성년입니다.");

}

else{

System.out.println("성년입니다.");

}

scanner.close();

}

다중 if

import java.util.Scanner;

public class Grading {
	public static void main(String[] args) {
		char grade;
		Scanner scanner = new Scanner(System.in);

		System.out.print("점수를 입력하세요(0~100):");
		int score = scanner.nextInt(); // 점수 읽기

		if(score >= 90){
			grade = 'A';
		}
		else if(score >= 80){
			grade = 'B';
		}
		else if(score >= 70){
			grade = 'C';
		}
		else if(score >= 60){
			grade = 'D';
		}
		else{
			grade = 'F';
		}

		System.out.println("학점은 " + grade + "입니다.");
		scanner.close();
	}
}

import java.util.Scanner;

public class Grading {

public static void main(String[] args) {

char grade;

Scanner scanner = new Scanner(System.in);

System.out.print("점수를 입력하세요(0~100):");

int score = scanner.nextInt(); // 점수 읽기

if(score >= 90){

grade = 'A';

}

else if(score >= 80){

grade = 'B';

}

else if(score >= 70){

grade = 'C';

}

else if(score >= 60){

grade = 'D';

}

else{

grade = 'F';

}

System.out.println("학점은 " + grade + "입니다.");

scanner.close();

}

switch case

import java.util.Scanner;

public class Grading {
	public static void main(String[] args) {
		char grade;
		Scanner scanner = new Scanner(System.in);

		System.out.print("점수를 입력하세요(0~100):");
		int score = scanner.nextInt(); // 점수 읽기

		if(score >= 90){
			grade = 'A';
		}
		else if(score >= 80){
			grade = 'B';
		}
		else if(score >= 70){
			grade = 'C';
		}
		else if(score >= 60){
			grade = 'D';
		}
		else{
			grade = 'F';
		}

		switch(grade) {
			case 'A':
				System.out.println("잘했습니다.");
				break;
			case 'B':
			case 'C':
				System.out.println("좋아요.");
				break;
			case 'D':
				System.out.println("노력하세요.");
				break;
			default:
				System.out.println("탈락입니다!");
				break;
		}

		scanner.close();
	}
}

import java.util.Scanner;

public class Grading {

public static void main(String[] args) {

char grade;

Scanner scanner = new Scanner(System.in);

System.out.print("점수를 입력하세요(0~100):");

int score = scanner.nextInt(); // 점수 읽기

if(score >= 90){

grade = 'A';

}

else if(score >= 80){

grade = 'B';

}

else if(score >= 70){

grade = 'C';

}

else if(score >= 60){

grade = 'D';

}

else{

grade = 'F';

}

switch(grade) {

case 'A':

System.out.println("잘했습니다.");

break;

case 'B':

case 'C':

System.out.println("좋아요.");

break;

case 'D':

System.out.println("노력하세요.");

break;

default:

System.out.println("탈락입니다!");

break;

}

scanner.close();

}

whan0623

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