在gcc下用到数学函数，如sqrt。在gcc时要加上 -lm 参数，这样告诉编译器我要用到数学函数了 。
如：gcc a.c -o a -lm 详细解决方案
相关解决方案
- Expression dqgrade is undefined on line 20, column 30-freemarker报这样的错如何解决
- 新手求教。spring+axis2集成的有关问题。The endpoint reference (EPR) for the Operation not found
- undefined for the type解决办法
- 初学者发问：The constructor Printwriter(String) is undefined
- flash 读取 servlet 生成的xml 展示 undefined
- 不时出现-object reference not set to an instance of an boject
- mvc过去台发送ajax请求得到的数据显示未定义（undefined）,哪位帮忙看看
- 在线请问调用Jquery异常:TypeError: a is undefined 的异常原因有哪些
- ASP.NET JavaScript “undefined”,该怎么解决
- 使用session时出现Object reference not set to an instance of an object.如何解决
- 发布dll，访问提示异常The located assembly's manifest definition with name 'Copy of TCL" does not match the assembly reference
- Object reference not set to an instance of an object.该如何处理
- Object reference not set to an instance of an object 到底什么有关问题啊
- 请问：打开数据库时提示：Object reference not set to an instance of an object
- 'undefined'为空或不是对象,该怎么解决
- 又是一个经典的Object reference not set to an instance of an object.解决方法
- asp.net高分:Object reference not set to an instance of an object
- Undefined symbol: '_CxxFrameHandler'？该如何解决
- undefined reference to异常怎么解决
- MTK Undefined symbol Image$$ZI$$Limit (referred from sys_stackheap.o) 怎么解决
- MTK平台链接异常：Undefined symbol Image$$ZI$$Limit
- CCS编译X264 ERROR string.h error:identifier "using" is undefined,该如何处理
- [急切]undefined RAS Dial Error 127 什么意思啊
- Processor ARM79_0 raised an exception.Cause: Undefined instruction,该如何处理
- Ada程序编译不过 提醒 Other is undefined
- : error A2006: undefined symbol : data解决办法
- TC 提示 Undefined Symbol '_brklvl' in module BRK 等异常，不知如何避免
- set udfparms to value|reference 命令 不起作用解决办法
- ColdFusion Java CFX Reference,该怎么解决
- apache配置httpd.conf异常 undefined symbol: ap_proxy_ftp_canon