C 获取 sin() 的值时构建错误 [英] C Build error when getting the value of sin()

问题描述

我最近开始学习 C 作为一个副项目.我正在 OpenSuse 下使用最新的 NetBeans，使用 GCC 作为编译工具集.我最早制作的程序之一是这样的:

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);
}

这是一个简单明了的示例，应该可以正常运行.但是，我在尝试编译时遇到构建错误:退出代码 2(第 18 行中的错误，未定义对 sin 的引用).有趣的是，如果我删除了 sin(rad) 的值分配给结果或用硬编码值替换 rad，程序编译得很好.我在这里做错了什么?

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中，需要链接到数学库:

In C, you need to link to the math library:

将此添加到命令行选项:

Add this to the command line options:

-lm

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