The error: undefined reference to 'main' in C program is a very stupid mistake by the programmer, it occurs when the main() function does not exist in the program. If you used main() function and still the error is there, you must check the spelling of the main() function....
参数c未定义啊 提示不是写了吗
1、1undefined是指页面出现了未知错误的原因的2看一下页面源码，如果源码上也是undefined那就说明页面本来就是这样，如果源码的这部分是js代码，就说明js代码使用的数据有问题3提示undefined一般是在开发网站的时候定义。2、undefined在计算机中是指没有找到或没有的意思，例如某个用户某个操作没有被获取到...
This is currently "by design" because usage of undeclared function identifiers is valid and doesn't generate a compiler error in C, giving: warning: implicit declaration of function 'func' [-Wimplicit-function-declaration] 3 | return func(); . We have an issue tracking potentially adding "...
如果是ubuntu linux, apache apt-get install php5-mysql /etc/init.d/apache restart 如果是ubuntu linux, nginx apt-get install php5-mysql /etc/init.d/nginx restart 如果是windows apache 打开apache的http.conf 找到 php5-mysql.dll 把它前面的";"去掉，重启apache ...
I downloaded Visual Studio Version 17.7.0 Preview 2.0 and tested the following code but the compilation failed with the same error in the previous version; error C2027: use of undefined type ‘type_info’. importstd;intmain(){ std::cout <<typeid(double).name() <<'\n'...
ERROR Error: Cannot read properties of undefined (reading '_fields') I do some research and it seems to be the commit f1add09 in the file src/core/src/lib/templates/field-array.type.ts.You have change the check of the model length.- const length = field.model ? field.model.length :...
起码fclose(fp)的位置不对啊, 不应该在循环里面, 应该放在循环的外面.另外, 写的文件后缀用.doc也不好吧, 用txt比较好.
$showAlert = false;if ($_SERVER["REQUEST_METHOD"] == "POST") { 我希望这会有所帮助。
c语言不可能是txt的扩展名 要么是c要么是h ,c用来放函数实现，h用来放函数声明，所以你main包含的时候包含.h就好了，不用包含c的文件，链接的时候把.o链接进来就好了，你这个错误是说你duiyi这个玩意没定义，也就是调用的函数没找到函数实现