Avoid include a Header more than once

DataEraserC · DataEraserC · commit 9b1f706c6e76 · 2021-12-18T22:07:21.000+08:00
diff --git a/cpp/test/include/head.hpp b/cpp/test/include/head.hpp
@@ -1,3 +1,5 @@
+#ifndef _head_hpp
+#define _head_hpp
 #include <iostream>
 #include <cstdio>
 #include <cstdlib>
@@ -22,3 +24,4 @@ struct head_link* add(){
     struct head_link *temp=(struct head_link*)malloc(sizeof(struct head_link));
     return temp;
 }
+#endif
diff --git a/cpp/test/include/onebot.h b/cpp/test/include/onebot.h
@@ -0,0 +1,7 @@
+#ifndef _onebot_h
+#define _onebot_h
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <iostream>
+#endif
diff --git a/cpp/test/include/str.h b/cpp/test/include/str.h
@@ -1,4 +1,7 @@
+#ifndef _str_h
+#define _str_h
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
 void strval(char **str1,const char *str2,int type);
+#endif
diff --git a/cpp/test/src/onebot.cpp b/cpp/test/src/onebot.cpp
@@ -0,0 +1,2 @@
+#include "../include/onebot.h"
+
diff --git a/cpp/test/src/test.cpp b/cpp/test/src/test.cpp
