diff --git a/day7/homework/oh1.cpp b/day7/homework/oh1.cpp
new file mode 100644
index 0000000..72584e4
--- /dev/null
+++ b/day7/homework/oh1.cpp
@@ -0,0 +1,22 @@
+// 输入一个整数，输出它的所有因数。
+// 例如：输入 12，输出 1 2 3 4 6 12
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    int n;
+    cout << "请输入一个整数：";
+    cin >> n;
+
+    int i = 1;
+    while (i <= n)
+    {
+        if (n % i == 0)
+            cout << i << "\t";
+        i++;
+    }
+
+    return 0;
+}
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