계산기 예제

package day4;

import java.util.Scanner;

public class Ex02_calculator2 {

public static void main(String[] args) {

// TODO Auto-generated method stub

 

Scanner sc = new Scanner(System.in);

double result = 0;

boolean run = true;

while(true) {

System.out.println("====계산기====");

System.out.println("1.더하기 2. 빼기 3.곱하기 4.나누기 5.나머지");

System.out.println("첫번째 숫자입력 >");

int num1 = sc.nextInt();

System.out.println("메뉴선택");

int menu = sc.nextInt();

if(menu < 1 || menu > 5) {

System.out.println("1부터 5까지 입력가능합니다");

continue;

}

System.out.println("두번째 숫자입력 >");

int num2 = sc.nextInt();

 

switch(menu) {

case 1:

System.out.printf("%d + %d = %d\n", num1,num2,(num1+num2));

result = num1+num2;

break;

case 2:

System.out.printf("%d - %d = %d\n", num1,num2,(num1-num2));

result = num1-num2;

break;

case 3:

System.out.printf("%d * %d = %d\n", num1,num2,(num1*num2));

result = num1*num2;

break;

case 4:

System.out.printf("%d / %d = %.2f\n", num1,num2,(num1/(double)num2));

result = num1/num2;

break;

case 5:

System.out.printf("%d %% %d = %d\n", num1,num2,(num1%num2));

result = num1%num2;

break;

}

System.out.println();

System.out.println("1.이어하기 2.새로하기 0.종료");

System.out.println("메뉴선택 >");

menu = sc.nextInt();

switch(menu) {

case 1:

while(true) {

System.out.println("1.더하기 2.빼기 3.곱하기 4.나누기 5.나머지");

menu = sc.nextInt();

System.out.println("숫자입력 >");

int num = sc.nextInt();

if(menu == 1) {

System.out.printf("%.2f + %d = %.2f",result,num,(result+num));

}else if(menu ==2) {

System.out.printf("%.2f - %d = %.2f",result,num,(result-num));

}else if(menu ==3) {

System.out.printf("%.2f * %d = %d.2f",result,num,(result*num));

}else if(menu ==4) {

System.out.printf("%.2f / %d = %.2f",result,num,(result/num));

}else if(menu ==5) {

System.out.printf("%.2f %% %d = %.2f",result,num,(result%num));

}

System.out.println();

System.out.println();

}

//break;

case 2:

break;

case 0:

run = false;

break;

default:

System.out.println("0~2까지 입력가능");

}

 

 

}

 

}

}

지금까지 배운것을 이용해서 계산기 만들어보기(옵션추가)