C编程 - "文件中引用的未定义符号"

Question

我正在尝试编写一个程序来估算pi.它基本上取0.00和1.00之间的随机点,并将它们与圆的界限进行比较,圆内点与总点的比率应接近pi(非常快速的解释,规范深入更多).

但是,在使用gcc进行编译时出现以下错误:

Undefined                       first referenced
symbol                          in file
pow                             /var/tmp//cc6gSbfE.o
ld: fatal: symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

发生了什么事？我以前从未见过这个错误,我不知道它为什么会出现.这是我的代码(虽然我没有完全测试它,因为我无法通过错误):

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

int main(void) {
    float x, y;
    float coordSquared;
    float coordRoot;
    float ratio;
    int n;
    int count;
    int i;

    printf("Enter number of points: ");
    scanf("%d", &n);

    srand(time(0));

    for (i = 0; i < n; i++) {
        x = rand();
        y = rand();

        coordSquared = pow(x, 2) + pow(y, 2);
        coordRoot = pow(coordSquared, 0.5);

        if ((x < coordRoot) && (y < coordRoot)) {
            count++;
        }
    }

    ratio = count / n;
    ratio = ratio * 4;

    printf("Pi is approximately %f", ratio);

    return 0;
}

Answer 1

-lm在编译(或链接)期间使用以包括数学库.

像这样: gcc yourFile.c -o yourfile -lm