Question

第27行返回错误（以“费用”开头的行）说明“未声明的引用（对于calculateCharge，我的最佳猜测）”和编译器说明“ld返回1退出状态” 我不能为我的生活得到需要改变的东西。

float calculateCharge(float);

int main()
{
  printf("Hello world!\n");

  int car;
  int num_cars;
  float total_charges = 0;
  float total_hours = 0;

  printf("How many cars?\n\n");      //prompt
  scanf("%d", &num_cars);            //prompt

  float hours [num_cars + 1];        //declaring parallel arrays
  float charges [num_cars + 1];

  for (car=1; car<=num_cars; car++)
  {
      printf("How many hours for car #%d?", car);     //prompt
      scanf("%f", &hours[car]);                       //input hours
      charges [car] = calculateCharge(hours [car]);
      total_charges = total_charges + charges [car];
      total_hours = total_hours + hours [car];
  }
  printf("%s\t%s\t%s\t", "Car", "Hours", "Charge");

  for (car = 1; car <=num_cars; car++)
  {
       printf("\n%d\t%.2f\t%.2f\n", car, hours[car], charges[car]);
  }

printf("\n%s\t%.2f\t%.2f\n", "Total", total_hours, total_charges);

return 0;
}

Answer 1

假设这是您的整个代码，您已经提供了calculateCharge签名的前向声明，因此编译器可以生成代码来调用它（一旦它知道实际定义在哪里），但你还没有提供实际的定义。

undefined reference返回退出状态

1 个答案: