diff --git a/day5/d6.cpp b/day5/d6.cpp
new file mode 100644
index 0000000..13a7614
--- /dev/null
+++ b/day5/d6.cpp
@@ -0,0 +1,16 @@
+// 测试一个整数能否被3整除
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    unsigned int n;
+    cout << "请输入一个整数：";
+    cin >> n;
+    if (n % 3 == 0)
+        cout << "能被3整除" << endl;
+    else
+        cout << "不能被3整除" << endl;
+    return 0;
+}
\ No newline at end of file