JAVA Basic : 연산자 (Operators)

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JAVA Basic : 연산자 (Operators)

총 식사비 구하기

※ 변수와 타입

식사비 : 세금과 팁 계산하기 전 원가를 입력받음

mealCost, Double

팁 퍼센트 : 식사비의 몇프로를 팁으로 할 건지 입력받음

tipPercent, int

세금 퍼센트 : 식사비의 몇프로를 세금으로 할 건지 입력받음

taxPercent, int

※ 계산 예

팁 : mealCost x tipPercent

세금 : mealCost x taxPercent

총 식사비 : mealCost + 팁 + 세금

소수점 버린 총 식사비 : round(총 식사비)

입력

12.00

20

8

출력

The total meal cost is 15 dollars.

코딩연습 - 1

100을 넘지 않는 int 값을 100으로 나누려고 하니 0 이 나올 수 밖에 없었다..

tipPercent와 taxPercent 값을 백분율로 어떻게든 고쳐야 할텐데...

public static void main(String[] args) {         Scanner scan = new Scanner(System.in);                  double mealCost = scan.nextDouble(); // original meal price         int tipPercent = scan.nextInt(); // tip percentage         int taxPercent = scan.nextInt(); // tax percentage         scan.close();                  // Write your calculation code here.         double tip = tipPercent/100;   System.out.println(tip);         double tax = taxPercent/100;   System.out.println(tax);         double totalmealCost = mealCost + tip + tax;    System.out.println(totalmealCost);                  // cast the result of the rounding operation to an int and save it as totalCost          int totalCost = (int) Math.round(totalmealCost);                // Print your result         System.out.println("The total meal cost is " + totalCost + " dollars."); }

결과 :  0.0 0.0 12.0 The total meal cost is 12 dollars.

코딩연습 - 2

tipPercent와 taxPercent 값이 현재 int형인데, 이것들을 double형으로 형변환을 해주면 되는 간단한 문제였...다;;

public static void main(String[] args) {         Scanner scan = new Scanner(System.in);                  double mealCost = scan.nextDouble(); // original meal price         int tipPercent = scan.nextInt(); // tip percentage         int taxPercent = scan.nextInt(); // tax percentage         scan.close();                  // Write your calculation code here.         double tip = (double)tipPercent/100;   System.out.println(tip);         double tax = (double)taxPercent/100;   System.out.println(tax);         double totalmealCost = mealCost + tip + tax;    System.out.println(totalmealCost);                  // cast the result of the rounding operation to an int and save it as totalCost          int totalCost = (int) Math.round(totalmealCost);                // Print your result         System.out.println("The total meal cost is " + totalCost + " dollars."); }

결과 :  0.2 0.08 12.28 The total meal cost is 12 dollars.

결과

public static void main(String[] args) {         Scanner scan = new Scanner(System.in);                  double mealCost = scan.nextDouble(); // original meal price         int tipPercent = scan.nextInt(); // tip percentage         int taxPercent = scan.nextInt(); // tax percentage         scan.close();                  // Write your calculation code here.         double tip = mealCost * (double)tipPercent/100;         double tax = mealCost * (double)taxPercent/100;         double totalmealCost = mealCost + tip + tax;                  // cast the result of the rounding operation to an int and save it as totalCost          int totalCost = (int) Math.round(totalmealCost);                // Print your result         System.out.println("The total meal cost is " + totalCost + " dollars."); }

결과 :  The total meal cost is 15 dollars.