我如何获得加速度的值？

Question

我正在创建一个程序来计算平均加速度。它工作得很好，但我似乎无法获得加速度的值。谁能教我为什么会发生这种情况以及如何解决这个问题？ 求帮助

#include <iostream>
using namespace std;

//--------------------------------------------------------------------------//
void Getdata(double &Vstart, double &Vend, double &time);
void calculate(double &Vstart, double &Vend, double &time, double &accel);
void Displayoutput(double &out);

//--------------------------------------------------------------------------//
int main() {
  double Vstart = 0.0;
  double Vend = 0.0;
  double time = 0.0;
  double accel,out = 0;

  cout << "please enter your velocity(Vo=m/s)\n,velocity(Vt=m/s)\nand time(s=second)\n\n";
  Getdata(Vstart, Vend, time);
  calculate(Vstart, Vend, time, accel);
  Displayoutput(out);
  return 0;
}

//--------------------------------------------------------------------------//
void Getdata(double &Vstart, double &Vend, double &time) {
  cin >> Vstart;
  cin >> Vend;
  cin >> time;
  cout << "your Vo=" << Vstart << " ,Vt=" << Vend << " and T=" << time << "\n\n";
}

//--------------------------------------------------------------------------//
void calculate(double &Vstart, double &Vend, double &time, double &accel) {
  accel = (Vstart - Vend) / time;
}

//--------------------------------------------------------------------------//
void Displayoutput(double &out) {

  cout << "the acceleration =" << out;
}

//--------------------------------------------------------------------------//

Answer 1

改变

Displayoutput(out);

到

Displayoutput(accel);