diff --git a/1659_n!/Readme.md b/1659_n!/Readme.md
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+# 标题
+
+* 内容
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diff --git a/1659_n!/doc/Readme.md b/1659_n!/doc/Readme.md
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+# 	『入门』（递归专题）求n!的值
+[问题描述]  
+
+教学案例，必须使用递归函数完成求解！  
+
+　　　n!=1*2*...*n。例：5!=1*2*3*4*5=120。编程求：n!＝？  
+
+[输入格式]  
+　　一个整数n，（ n <= 15 ）  
+
+[输出格式]  
+　　一个整数，n!的运算结果。  
+
+[输入样例]  
+3  
+
+[输出样例]  
+6  
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diff --git a/1659_n!/main.cpp b/1659_n!/main.cpp
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+//阶乘（超小）
+#include <iostream>
+using namespace std;
+long long dg(long long n){
+    if(n==1){
+        return 1;
+    }
+    return n+dg(n-1);
+}
+int main()
+{
+    int n;
+    cin>>n;
+    cout<<dg(n);
+}
diff --git a/1659_n!/main.exe b/1659_n!/main.exe
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index 0000000..83e5338
Binary files /dev/null and b/1659_n!/main.exe differ
diff --git a/1659_n!/test/in.txt b/1659_n!/test/in.txt
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+++ b/1659_n!/test/in.txt
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+1
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diff --git a/1659_n!/test/in2.txt b/1659_n!/test/in2.txt
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+++ b/1659_n!/test/in2.txt
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+15
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diff --git a/1659_n!/test/in3.txt b/1659_n!/test/in3.txt
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+++ b/1659_n!/test/in3.txt
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+4
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diff --git a/1659_n!/test/out.txt b/1659_n!/test/out.txt
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+## z:\Chao\src\1659_n!\test\in.txt 
+2020/04/24 周五 13:42:16.59 
+1
+-----------------------------------------------
+Process exited after 190 ms with return value 0
+
+## z:\Chao\src\1659_n!\test\in2.txt 
+2020/04/24 周五 13:42:16.59 
+1307674368000
+-----------------------------------------------
+Process exited after 100 ms with return value 0
+
+## z:\Chao\src\1659_n!\test\in3.txt 
+2020/04/24 周五 13:42:16.59 
+24
+-----------------------------------------------
+Process exited after 110 ms with return value 0
+