[BOJ] 5949 Adding Commas (B3)

Author: abcxj123

정건우/7주차/260212.java

@@ -0,0 +1,28 @@
+//https://www.acmicpc.net/problem/5949
+import java.util.Scanner;
+
+public class BOJ_B3_5949_AddingCommas {
+    public static void main(String[] args) {
+        Scanner scann = new Scanner(System.in);
+        StringBuilder sb = new StringBuilder();
+
+        String N = scann.nextLine();
+        int cnt = 0;
+
+        for (int i = N.length()-1; i >= 0; i--) {
+            if(cnt % 3 == 0) sb.append(',');
+
+            sb.append(N.charAt(i));
+
+            cnt++;
+        }
+
+        sb = sb.reverse();
+
+        if(sb.charAt(sb.length()-1) == ','){
+            sb.setLength(sb.length()-1);
+        }
+
+        System.out.println(sb.toString());
+    }
+}