c - C语言中如何调用void函数

Question

好吧，我已经编写了具有四个不同功能的代码，其主要目的是在表格中显示从 0-90 角度的速度的角度、时间、距离。速度由用户输入。但是，当我调用正在创建该函数的 void 函数时，我收到错误“对`create_table'的 undefined reference ”这是我的代码。

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

#define G 9.8   /* gravitation acceleration 9.8 m/s^2 */
#define PI 3.141592654

void create_table(double v);
double Projectile_travel_time(double a, double v);
double Projectile_travel_distance(double a, double v);
double degree_to_radian(double d);

int main(void)
{
    int n;
    double velocity;

    printf ("please enter the velocity at which the projectile is launched (m/sec): ");
    n = scanf("%lf" ,&velocity);

    if(n != 1)
    {
        printf("Invlid input. Bye...");
        exit(1);
    }

    while (velocity < 0 )
    {
        printf ("please enter a positive number for velocity: ");
        n = scanf("%lf", &velocity);
        if(n != 1)
        {
            printf("Invlid input. Bye...");
            exit(1);
        }
    }
    create_table(velocity);


    return 0;
}
  void create_table(double v)
    {
        printf("Angle      t      d\n");
        printf("(deg)    (sec)   (m)\n");

        double a,i;
        for( a=0; a<=90; a+=5)
        {
            for(i=0; i<=2; i++)
            {
                double t = Projectile_travel_time(a, v);
                double s = Projectile_travel_distance(a, v);
                printf("%d       %d       %d\n", a, t, s);

            }
        }


    }
    double Projectile_travel_time(double a, double v)
    {
        double t = ((2*v*sin(degree_to_radian(a)))/(G));
        return t;
    }
    double Projectile_travel_distance(double a, double v)
    {
        double d = ((v*v)/G)*sin(2*degree_to_radian(a));
        return d;
    }

    double degree_to_radian(double d)
    {
         double r = d*atan(1) * 4 / 180;
         return r;
    }

如有任何帮助，我们将不胜感激。谢谢

编辑 我已经编辑了代码，但现在遇到了另一个问题，我的输出完全关闭。我的功能不正确有什么建议吗？

Answer 1

您必须将创建的函数保留在主函数之外