JAVA/자바 문제

이칙 연산 계산기 (LinkedList)

해병1188기 2018. 3. 21. 20:02
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import java.util.*;
 
public class Calculator {//
 
    public static void main(String[] args) {
        LinkedList<Integer> numList = new LinkedList<Integer>(); //제너릭
        LinkedList<Character> opList = new LinkedList<Character>();
        
        Scanner sc = new Scanner(System.in);//입력
        
        String s = sc.nextLine(); 
        
        String num = "";
        
        for(int i = 0; i < s.length(); i++)
        {
            char ch = s.charAt(i);//문자중에 인텍스 위치에 해당되는 문자 추출
            
            if(ch == '+')
            {
                numList.add(Integer.parseInt(num));
                opList.add(ch);
                num = "";
                continue;
            }
            else if(ch == '-') 
            {
                numList.add(Integer.parseInt(num));
                opList.add(ch);
                num = "";    
                continue;
            }
            num += ch;
        }
        numList.add(Integer.parseInt(num));
 
        while(!opList.isEmpty()) {
            int prevNum = numList.poll();
            int nextNum = numList.poll();
            char op = opList.poll();
            
            if(op == '+') {
                numList.addFirst(prevNum + nextNum);
            } else if(op == '-') {
                numList.addFirst(prevNum - nextNum);
            }
        }
        
        System.out.println(numList.poll());
    }
 
}
 
cs

2+3-3+등등 연속해서 계산된다 (+ ,)-

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