diff --git a/exercises/00_hello_world/main.cpp b/exercises/00_hello_world/main.cpp
index 8866f3c15..5a9d962b7 100644
--- a/exercises/00_hello_world/main.cpp
+++ b/exercises/00_hello_world/main.cpp
@@ -1,11 +1,11 @@
 #include "../exercise.h"
-
+#include <iostream>
 // READ: std streams <https://zh.cppreference.com/w/cpp/io/c/std_streams>
 // READ: 流修饰符 <https://zh.cppreference.com/w/cpp/io/manip>
 // READ: format in cxx20 <https://zh.cppreference.com/w/cpp/utility/format/format>
 
 int main(int argc, char **argv) {
     // TODO: 在控制台输出 "Hello, InfiniTensor!" 并换行
-    std::cout : "Hello, InfiniTensor!" + std::endl;
+    std::cout <<"Hello, InfiniTensor!" >> std::endl;
     return 0;
 }