diff --git a/day7/homework/oh3.cpp b/day7/homework/oh3.cpp
new file mode 100644
index 0000000..8072471
--- /dev/null
+++ b/day7/homework/oh3.cpp
@@ -0,0 +1,27 @@
+// 输入一个整数，输出它的斐波那契数列。
+// 例如：输入10，输出1 1 2 3 5 8
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    int n;
+    cout << "请输入一个整数：";
+    cin >> n;
+
+    int a = 1;
+    int b = 1;
+    int c = 0;
+    cout << a << "\t" << b << "\t";
+    while (c <= n)
+    {
+        c = a + b;
+        if (c <= n)
+            cout << c << "\t";
+        a = b;
+        b = c;
+    }
+
+    return 0;
+}
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