diff --git a/src/main/java/leetcode/editor/cn/BianryNumberToStringLcci.java b/src/main/java/leetcode/editor/cn/BianryNumberToStringLcci.java
new file mode 100644
index 0000000..f2c5af6
--- /dev/null
+++ b/src/main/java/leetcode/editor/cn/BianryNumberToStringLcci.java
@@ -0,0 +1,64 @@
+//<p>二进制数转字符串。给定一个介于0和1之间的实数（如0.72），类型为double，打印它的二进制表达式。如果该数字无法精确地用32位以内的二进制表示，则打印“ERROR”。</p>
+//
+//<p><strong>示例1:</strong></p>
+//
+//<pre>
+//<strong> 输入</strong>：0.625
+//<strong> 输出</strong>："0.101"
+//</pre>
+//
+//<p><strong>示例2:</strong></p>
+//
+//<pre>
+//<strong> 输入</strong>：0.1
+//<strong> 输出</strong>："ERROR"
+//<strong> 提示</strong>：0.1无法被二进制准确表示
+//</pre>
+//
+//<p>&nbsp;</p>
+//
+//<p><strong>提示：</strong></p>
+//
+//<ul> 
+// <li>32位包括输出中的 <code>"0."</code> 这两位。</li> 
+// <li>题目保证输入用例的小数位数最多只有 <code>6</code> 位</li> 
+//</ul>
+//
+//<div><div>Related Topics</div><div><li>位运算</li><li>数学</li><li>字符串</li></div></div><br><div><li>👍 99</li><li>👎 0</li></div>
+package leetcode.editor.cn;
+
+// 面试题 05.02:二进制数转字符串
+public class BianryNumberToStringLcci {
+    public static void main(String[] args) {
+        Solution solution = new BianryNumberToStringLcci().new Solution();
+        // TO TEST
+        solution.printBin(0.625);
+    }
+
+    //leetcode submit region begin(Prohibit modification and deletion)
+    class Solution {
+        public String printBin(double num) {
+            String str = "0.";
+            String strNum = "" + num;
+            while (strNum.endsWith("0")) {
+                strNum = strNum.substring(0, strNum.length() - 1);
+            }
+            while (num > 0 && strNum.endsWith("5")) {
+                num *= 2;
+                if (num >= 1) {
+                    str += 1;
+                    num -= 1;
+                } else {
+                    str += 0;
+                }
+                strNum = "" + num;
+                while (strNum.endsWith("0")) {
+                    strNum = strNum.substring(0, strNum.length() - 1);
+                }
+            }
+            return strNum.equals("0.") ? str : "ERROR";
+        }
+    }
+//leetcode submit region end(Prohibit modification and deletion)
+
+}
diff --git a/src/main/java/leetcode/editor/cn/doc/content/BianryNumberToStringLcci.md b/src/main/java/leetcode/editor/cn/doc/content/BianryNumberToStringLcci.md
new file mode 100644
index 0000000..5d00058
--- /dev/null
+++ b/src/main/java/leetcode/editor/cn/doc/content/BianryNumberToStringLcci.md
@@ -0,0 +1,27 @@
+<p>二进制数转字符串。给定一个介于0和1之间的实数（如0.72），类型为double，打印它的二进制表达式。如果该数字无法精确地用32位以内的二进制表示，则打印“ERROR”。</p>
+
+<p><strong>示例1:</strong></p>
+
+<pre>
+<strong> 输入</strong>：0.625
+<strong> 输出</strong>："0.101"
+</pre>
+
+<p><strong>示例2:</strong></p>
+
+<pre>
+<strong> 输入</strong>：0.1
+<strong> 输出</strong>："ERROR"
+<strong> 提示</strong>：0.1无法被二进制准确表示
+</pre>
+
+<p>&nbsp;</p>
+
+<p><strong>提示：</strong></p>
+
+<ul> 
+ <li>32位包括输出中的 <code>"0."</code> 这两位。</li> 
+ <li>题目保证输入用例的小数位数最多只有 <code>6</code> 位</li> 
+</ul>
+
+<div><div>Related Topics</div><div><li>位运算</li><li>数学</li><li>字符串</li></div></div><br><div><li>👍 99</li><li>👎 0</li></div>
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