Question

我试图编写一个程序来计算不同时间点球的高度，但每当我尝试编译时，我都会得到错误LNK2019。此外，它一直告诉我我的双打转换为整数，但我不知道为什么。

1＆gt; ------构建开始：项目：抛物线，配置：调试Win32 ------ 1 GT; Parabola.cpp 1＆gt; c：\ users \ oliver \ documents \ visual studio 2015 \ projects \ parabola \ parabola \ constants.h（2）：警告C4244：＆＃39;初始化＆＃39;：转换为＆＃39; double＆＃39;到＆＃39; int＆＃39;，可能会丢失数据 1＆gt; c：\ users \ oliver \ documents \ visual studio 2015 \ projects \ parabola \ parabola \ parabola.cpp（20）：警告C4244：＆＃39;参数＆＃39;：转换自＆＃39; double＆＃39;到＆＃39; int＆＃39;，可能会丢失数据 1＆gt; c：\ users \ oliver \ documents \ visual studio 2015 \ projects \ parabola \ parabola \ parabola.cpp（21）：警告C4244：＆＃39;参数＆＃39;：转换自＆＃39; double＆＃39;到＆＃39; int＆＃39;，可能会丢失数据 1＆gt; c：\ users \ oliver \ documents \ visual studio 2015 \ projects \ parabola \ parabola \ parabola.cpp（22）：警告C4244：＆＃39;参数＆＃39;：转换自＆＃39; double＆＃39;到＆＃39; int＆＃39;，可能会丢失数据 1＆gt; c：\ users \ oliver \ documents \ visual studio 2015 \ projects \ parabola \ parabola \ parabola.cpp（23）：警告C4244：＆＃39;参数＆＃39;：转换自＆＃39; double＆＃39;到＆＃39; int＆＃39;，可能会丢失数据 1＆gt; c：\ users \ oliver \ documents \ visual studio 2015 \ projects \ parabola \ parabola \ parabola.cpp（24）：警告C4244：＆＃39;参数＆＃39;：转换自＆＃39; double＆＃39;到＆＃39; int＆＃39;，可能会丢失数据 1＆gt; c：\ users \ oliver \ documents \ visual studio 2015 \ projects \ parabola \ parabola \ parabola.cpp（25）：警告C4244：＆＃39;参数＆＃39 ;:转换自＆＃39; double＆＃39;到＆＃39; int＆＃39;，可能会丢失数据 1 GT; Functions.cpp 1＆gt; c：\ users \ oliver \ documents \ visual studio 2015 \ projects \ parabola \ parabola \ constants.h（2）：警告C4244：＆＃39;初始化＆＃39;：转换为＆＃39; double＆＃39;到＆＃39; int＆＃39;，可能会丢失数据 1 GT;生成代码...... 1＆gt; Parabola.obj：错误LNK2019：未解析的外部符号＆＃34; double __cdecl ballHeight（int，double）＆＃34; （？ballHeight @@ YANHN @ Z）在函数_main中引用 1＆gt; C：\ Users \ OLIVER \ Documents \ Visual Studio 2015 \ Projects \ Parabola \ Debug \ Parabola.exe：致命错误LNK1120：1未解析的外部 ==========构建：0成功，1个失败，0个最新，0个跳过==========

以下是所有文件。

主要

#include "stdafx.h"
#include <iostream>
#include "FUNCTIONS.h"
#include "CONSTANTS.h"



int main()
{
using namespace std;

cout << "Enter the height of a building (in metres) you wish to simulate dropping a ball off of." << endl;
double bHeight = getHeight(); //Building height is defined


ballHeight(bHeight, 0); //Calls the function ballHeight at various points in time
ballHeight(bHeight, 1);
ballHeight(bHeight, 2);
ballHeight(bHeight, 3);
ballHeight(bHeight, 4);
ballHeight(bHeight, 5);

return 0;
}

功能

#include "stdafx.h"
#include <iostream>
#include "CONSTANTS.h"
#include "FUNCTIONS.h"

double getHeight() 
{
    using namespace std;
    double x = 0;
    cin >> x;
    return x;
}

double ballHeight(double bHeight, int seconds)
{
    using namespace std;

    double currentHeight = bHeight - gConstant * seconds * seconds / 2; //Calculates current ball height.

    cout << "At " << seconds << " seconds, the ball is at height: " << currentHeight << " metres." << endl; //Returns the ball height.
    return 0;
}

FUNCTIONS.h

#pragma once
#include "stdafx.h"
int main();
double getHeight();
double ballHeight(int seconds, double bHeight);
void tryAgain();

CONSTANTS.h

#pragma once
const int gConstant = 9.8;

Answer 1

double ballHeight(double bHeight, int seconds)

VS

double ballHeight(int seconds, double bHeight)

签名不同。

是什么导致我得到链接器错误LNK2019？

1 个答案: