ç建设得到了罪的值时,误差() [英] C Build error when getting the value of sin()
问题描述
我最近开始学习C作为一个辅助项目。我OpenSuse当中下工作,使用海合会作为工具集编译最新的NetBeans。
其中的第一方案,我做的是:
I have recently started learning C as a side project. I am working under OpenSuse with the latest NetBeans using the GCC as toolset for compiling. One of the very first programs that I made was this:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
/*
*
*/
int main(int argc, char** argv) {
double rad = 1;
double result = 0;
result = sin(rad);
return (EXIT_SUCCESS);
}
这是应该没有问题的工作简单,想都不用想的例子。在编译的时候退出code 2(第18行,未定义的引用错误罪):不过,我得到生成错误。
有趣的是,如果我删除罪(RAD)的值的分配导致或用硬codeD值替换弧度,程序编译就好了。
我在做什么错在这里?
This is a simple, no-brainer example that should have worked without a problem. However, I get a Build Error: Exit code 2(error in line 18, undefined reference to sin) when trying to compile. Interestingly enough, if I remove the assignment of the value of sin(rad) to result OR replace rad with a hard coded value, the program compiles just fine. What am I doing wrong here?
推荐答案
在C,你需要链接到数学库:
In C, you need to link to the math library:
这添加到命令行选项:
-lm
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