错误：未定义的数学函数参考 [英] Error: undefined reference to math functions

问题描述

这是函数指针程序：demo.c

This is function pointer program: demo.c

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

void tabulate(double (*f)(double), double first, double last, double incr);

int main(void) {

    double final, increment, initial;

    printf("Enter initial value: ");
    scanf("%lf", &initial);

    printf("Enter final value: ");
    scanf("%lf", &final);

    printf("Enter increment: ");
    scanf("%lf", &increment);

    printf("\n      x       cos(x)"
           "\n   -------    -------\n");
    tabulate(cos, initial, final, increment);
    return 0;
}

void tabulate(double (*f)(double), double first, double last, double incr) {
    double x;
    int i, num_intervals;

    num_intervals = ceil((last - first)/incr);
    for(i=0; i<=num_intervals; i++) {
        x = first + i * incr;
        printf("%10.5f %10.5f\n", x, (*f)(x));
    }
}

当我尝试运行此代码时， ：

When I try to run this code, got this message:

/tmp/ccQ4IZeD.o: In function `main':
demo.c:(.text+0x92): undefined reference to `cos'
/tmp/ccQ4IZeD.o: In function `tabulate':
demo.c:(.text+0xe3): undefined reference to `ceil'
collect2: error: ld returned 1 exit status

这意味着什么，因为cos和ceil是< math.h> 文件功能。
这是因为操作系统（ubuntu 13.10 32位），因为这个程序是在其他系统上工作。

What does it means, because cos and ceil is <math.h> file function. Is this is because of OS (ubuntu 13.10 32-bits), because this program is work on else system.

如果是，那么什么解决方案是在我的系统上运行。

If it yes, then what solution is to run on my system.

推荐答案

您必须使用 -lm 在链接时。

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