[COS PRO 1급 기출문제 - Java] 1-3 계산기 by 문자열

edu.goorm.io/learn/lecture/17301/cos-pro-1%EA%B8%89-%EA%B8%B0%EC%B6%9C%EB%AC%B8%EC%A0%9C-java/lesson/839397/1%EC%B0%A8-%EB%AC%B8%EC%A0%9C3-%EA%B3%84%EC%82%B0%EA%B8%B0-by-%EB%AC%B8%EC%9E%90%EC%97%B4-java

goorm

 

문제 유형

빈칸 채우기

 

문제

// 여기에 import 문을 추가할 수 있습니다.
//import java.util.*;
 
class Main {
    class Pair{
        public int firstNum;
        public int secondNum;
    }
    
    public int func_a(int numA, int numB, char exp){
        if (exp == '+')
            return numA + numB;
        else if (exp == '-')
            return numA - numB;
        else
            return numA * numB;
    }
    
    public int func_b(String exp){
        for(int i = 0; i < exp.length(); i++){
            char e = exp.charAt(i);
            if(e == '+' || e == '-' || e == '*')
                return i;
        }
        return -1;
    }
    public Pair func_c(String exp, int idx){
        Pair ret = new Pair();
        ret.firstNum = Integer.parseInt(exp.substring(0, idx));
        ret.secondNum = Integer.parseInt(exp.substring(idx + 1));
        return ret;
    }
    
    public int solution(String expression) {
        int expIndex = ____(____);
        Pair numbers = ____(____);
        int result = ____(____);
        return result;
    }

 

풀이

// 여기에 import 문을 추가할 수 있습니다.
//import java.util.*;
 
class Main {
    class Pair{
        public int firstNum;
        public int secondNum;
    }
    
    public int func_a(int numA, int numB, char exp){
        if (exp == '+')
            return numA + numB;
        else if (exp == '-')
            return numA - numB;
        else
            return numA * numB;
    }
    
    public int func_b(String exp){
        for(int i = 0; i < exp.length(); i++){
            char e = exp.charAt(i);
            if(e == '+' || e == '-' || e == '*')
                return i;
        }
        return -1;
    }
    public Pair func_c(String exp, int idx){
        Pair ret = new Pair();
        ret.firstNum = Integer.parseInt(exp.substring(0, idx));
        ret.secondNum = Integer.parseInt(exp.substring(idx + 1));
        return ret;
    }
    
    public int solution(String expression) {
        int expIndex = func_b(expression);
        Pair numbers = func_c(expression,expIndex);
        int result = func_a(numbers.firstNum, numbers.secondNum, expression.charAt(expIndex));
        return result;
    }