如果你在C++中使用string,确保你的代码中包含了正确的头文件: cpp #include <string> 这个头文件定义了std::string类,所以你需要使用std::string来声明字符串变量,除非你已经在你的代码中使用了using namespace std;。 验证编译器是否支持C++标准库,并且正确配置: 确保你使用的编译器支持C++标
3: identifier "string" is undefined". (even have #include <string> and using namespace std;) 4: string is not in std; //其实这个Error很常见。 备注:对于Error2也可以在VSCode中File->Preferences->Settings在右侧的自定义配置中添加 "C_Cpp.intelliSenseEngine": "Tag Parser"。但不推荐这样做。
std::string str; OR usingnamespacestd; Using this code change you can resolvec++ identifier string is undefinedfrom your program. 4) identifiersystemis undefined c++ #include <stdio.h> intmain() { system("pause"); // error C3861: 'system': identifier not found ...
在settings.json里添加 {"C_Cpp.default.cStandard":"gnu99"} 关键是那个gnu,因为getopt.h是unix c标准里的,在standard c库里
identifier "x" undefined ...wherexisnamespaceorclass. There are other errors. #20, 757, 169, and associated parsing issues like #65 The code used to compile (months ago, am just returning to it after a hiatus). It has mixed *.c and *.cpphas anything changed that maybe would force...
(string lastName, string firstName, int age) { nameListNode *nodePtr, *previousNode; if (!head) // If the list is empty, return return false; if (head->firstN == firstName) // Determine if the first node is the { nodePtr = head-> next; delete head; head = nodePtr; return ...
stm32单片机编译报错:error: #20: identifier “TIM2_IRQn” is undefined 出错的原因:选择单片机型号头文件不对 出错例字如下图: 编译报错: 解决此错误步骤: 1、选择工具栏中的魔法棒 2、选择Options窗口中的C/C++选项,修改对应单片机的头文件,即可解决此错误,要确定自己在编写程序选的单片机型号是多少。 比如...
c_cpp_properties.json looks like this: espressif-botadded theStatus: OpenedIssue is newlabelMar 29, 2022 github-actionsbotchanged the titleidentifier "CONFIG_LOG_MAXIMUM_LEVEL" is undefined C/C++(20)Mar 29, 2022 espressif-botassigned0xjakobMar 29, 2022 ...
/usr/include/c++/8.1.0/bits/string_view.tcc tag parsing file: /usr/include/c++/8.1.0/cstdlib tag parsing file: /usr/include/c++/8.1.0/cstdio tag parsing file: /usr/include/c++/8.1.0/bits/locale_classes.h tag parsing file: /usr/include/c++/8.1.0/system_error tag parsing file: /us...
在header file中实现define variables本身就是错误的，需要move到c/cpp中