From 52adce4d98a3983c7bed6e2f4b0e2fef7681f2a5 Mon Sep 17 00:00:00 2001
From: EastRain816 <dder2dder2@gmail.com>
Date: Fri, 26 Dec 2025 19:03:11 +0900
Subject: [PATCH] =?UTF-8?q?[14=EA=B8=B0]=20=EA=B3=BD=EB=8F=99=EC=9A=B0=20?=
 =?UTF-8?q?=EA=B3=BC=EC=A0=9C=20=EC=A0=9C=EC=B6=9C=ED=95=A9=EB=8B=88?=
 =?UTF-8?q?=EB=8B=A4.?=
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---
 src/main/java/gpacalc/Application.java | 125 ++++++++++++++++++++++++-
 1 file changed, 123 insertions(+), 2 deletions(-)

diff --git a/src/main/java/gpacalc/Application.java b/src/main/java/gpacalc/Application.java
index 57e79e1..a4ab22f 100644
--- a/src/main/java/gpacalc/Application.java
+++ b/src/main/java/gpacalc/Application.java
@@ -1,7 +1,128 @@
 package gpacalc;
+import java.util.*;
 
 public class Application {
     public static void main(String[] args) {
-        //TODO: 구현
+
+        Scanner s = new Scanner(System.in);
+        String input = "";
+        String[] majorInput;
+        String[] generalInput;
+        int credit = 0;
+        double gpaAvg = 0.0;
+        double majorGpaAvg = 0.0;
+        double gpaOfSubject = 0.0;
+        int creditOfSubject = 0;
+        double weight = 0.0;
+
+        System.out.println("전공 과목명과 이수학점, 평점을 입력해주세요(예시: 프로그래밍언어론-3-A+,소프트웨어공학-3-B+):");
+        input = s.next();
+        majorInput = input.split(",");
+        validation(majorInput);
+
+        System.out.println("\n교양 과목명과 이수학점, 평점을 입력해주세요(예시: 선형대수학-3-C0,인간관계와자기성장-3-P):");
+        input = s.next();
+        generalInput = input.split(",");
+        validation(generalInput);
+
+        System.out.println("\n<과목 목록>");
+        for (String string : majorInput) {
+            System.out.print("[전공] ");
+            creditOfSubject = calculateCredit(string);
+            gpaOfSubject = calculateGpa(string);
+
+            if(gpaOfSubject != 5.0 && gpaOfSubject != -1.0) {
+                gpaAvg += gpaOfSubject * creditOfSubject; // P, NP는 평점에서 제외
+                weight += creditOfSubject; // 가중치에서도 제외
+            }
+
+            if(gpaOfSubject != 0.0 && gpaOfSubject != -1.0) credit += creditOfSubject; // F, NP는 취득학점 제외
+        }
+        majorGpaAvg = gpaAvg / weight;
+
+        for (String string : generalInput) {
+            System.out.print("[교양] ");
+            creditOfSubject = calculateCredit(string);
+            gpaOfSubject = calculateGpa(string);
+
+            if(gpaOfSubject != 5.0 && gpaOfSubject != -1.0) {
+                gpaAvg += gpaOfSubject * creditOfSubject; // P, NP는 평점에서 제외
+                weight += creditOfSubject; // 가중치에서도 제외
+            }
+
+            if(gpaOfSubject != 0.0 && gpaOfSubject != -1.0) credit += creditOfSubject; // F, NP는 취득학점 제외
+        }
+        gpaAvg = gpaAvg / weight;
+
+        System.out.println("\n<취득학점>");
+        System.out.println(credit + "학점");
+        System.out.println("\n<평점평균>");
+        System.out.println(String.format("%.2f", gpaAvg) + " / 4.5");
+        System.out.println("\n<전공 평점평균>");
+        System.out.println(String.format("%.2f", majorGpaAvg) + " / 4.5");
+    }
+
+    public static double calculateGpa(String subjectInput){
+
+        String[] subjectInfo = subjectInput.split("-");
+
+        for(int i = 0; i < subjectInfo.length; i++){
+            System.out.print(subjectInfo[i]);
+            if(i != 2) System.out.print(",");
+            else System.out.println();
+        }
+
+        double gpa = 0.0;
+
+        if(subjectInfo[2].equals("A+")){
+            gpa = 4.5;
+        } else if (subjectInfo[2].equals("A0")) {
+            gpa = 4.0;
+        } else if (subjectInfo[2].equals("B+")) {
+            gpa = 3.5;
+        } else if (subjectInfo[2].equals("B0")) {
+            gpa = 3.0;
+        } else if (subjectInfo[2].equals("C+")) {
+            gpa = 2.5;
+        } else if (subjectInfo[2].equals("C0")) {
+            gpa = 2.0;
+        }else if (subjectInfo[2].equals("D+")) {
+            gpa = 1.5;
+        } else if (subjectInfo[2].equals("D0")) {
+            gpa = 1.0;
+        } else if (subjectInfo[2].equals("P")) {
+            gpa = 5.0;
+        } else if (subjectInfo[2].equals("NP")) {
+            gpa = -1.0;
+        }
+        return gpa;
+    }
+
+    public static int calculateCredit(String subjectInput){
+        String[] subjectInfo = subjectInput.split("-");
+        return Integer.parseInt(subjectInfo[1]);
+    }
+
+    public static void validation(String[] subjectsInput){
+        String[] subjectInfo;
+        for(int i = 0; i < subjectsInput.length; i++){
+            subjectInfo = subjectsInput[i].split("-");
+            if(subjectInfo[0].length() > 10 || subjectInfo[0].isBlank()) throw new IllegalArgumentException("잘못된 과목명 입력");
+            if(Integer.parseInt(subjectInfo[1]) < 1 || Integer.parseInt(subjectInfo[1]) > 4) throw new IllegalArgumentException("잘못된 학점 입력");
+            switch (subjectInfo[2]) {
+                case "A+": break;
+                case "A0": break;
+                case "B+": break;
+                case "B0": break;
+                case "C+": break;
+                case "C0": break;
+                case "D+": break;
+                case "D0": break;
+                case "F": break;
+                case "P": break;
+                case "NP": break;
+                default: throw new IllegalArgumentException("잘못된 성적 입력");
+            }
+        }
     }
-}
+}
\ No newline at end of file