diff --git a/CppPeculiarity/cpptask/cpp11/nullptr.cpp b/CppPeculiarity/cpptask/cpp11/nullptr.cpp
new file mode 100644
index 0000000..9c031e8
--- /dev/null
+++ b/CppPeculiarity/cpptask/cpp11/nullptr.cpp
@@ -0,0 +1,14 @@
+#include <iostream>
+void func(void *ptr) 
+{
+    std::cout << "func ptr" << std::endl;
+}
+void func(int i) 
+{
+    std::cout << "func i" << std::endl;
+}
+int main() {
+    //func(NULL); 编译失败，会产生二义性
+    func(nullptr); // 输出func ptr
+    return 0;
+}
\ No newline at end of file
diff --git a/CppPeculiarity/cpptask/cpp11/nullptr.exe b/CppPeculiarity/cpptask/cpp11/nullptr.exe
new file mode 100644
index 0000000..1544dae
Binary files /dev/null and b/CppPeculiarity/cpptask/cpp11/nullptr.exe differ