編集履歴

回答編集履歴

コード修正

2020/08/29 22:13

投稿

スコア8224

test CHANGED Viewed

@@ -88,69 +88,69 @@
 import java.util.Scanner;
-import java.util.regex.MatchResult;
+import java.util.regex.*; // Pattern, MatchResult;
 class Test {
-	public static void main(String[] args) {
+    public static void main(String[] args) {
-		Scanner sc = new Scanner(System.in);
+        Scanner sc = new Scanner(System.in);
-		while (true) {
+		Pattern pat = Pattern.compile("(\d+)\s*(.)\s*(\d+)\s*=");
-			System.out.print(">> ");
+        while (true) {
-			if (!sc.hasNextLine()) break;
+            System.out.print(">> ");
-			String line = sc.nextLine();
+            if (!sc.hasNextLine()) break;
-			Scanner sc2 = new Scanner(line);
+            String line = sc.nextLine();
-			try {
+            Scanner sc2 = new Scanner(line);
-				sc2.findInLine("(\d+)\s*(.)\s*(\d+)\s*=");
+            try {
-				MatchResult r = sc2.match();
+                sc2.findInLine(pat);
-				if (r.groupCount() != 3) throw new Exception();
+                MatchResult r = sc2.match();
-				int x = Integer.valueOf(r.group(1));
+                int x = Integer.parseInt(r.group(1));
-				int y = Integer.valueOf(r.group(3));
+                int y = Integer.parseInt(r.group(3));
-				int z = 0;
+                int z = 0;
-				switch (r.group(2)) {
+                switch (r.group(2)) {
-				case "+": z = x + y; break;
+                case "+": z = x + y; break;
-				case "-": z = x - y; break;
+                case "-": z = x - y; break;
-				case "*": z = x * y; break;
+                case "*": z = x * y; break;
-				case "/": z = x / y; break;
+                case "/": z = x / y; break;
-				}
+                }
-				System.out.println(z);
+                System.out.println(z);
-			}
+            }
-			catch (Exception e) {
+            catch (Exception e) {
-				System.out.println("  Error");
+                System.out.println("  Error");
-			}
+            }
-			sc2.close();
+            sc2.close();
-		}
+        }
-		sc.close();
+        sc.close();
-	}
+    }
 }