我对所有这些都很陌生，所以如果我的格式不正确或者问了一个愚蠢的问题，请原谅我。目前我在学校上C++入门课，我的教授对此没有任何帮助。编写一个程序，使用分配指定的三个函数（getData，getAvg和getLowestAndHighestSalary）来处理填充有各种职务和薪资范围（从低到高）的输入文件。在构建程序时，我试图捕捉出现的任何拼写错误/哑巴错误，我注意到只要我尝试引用getData和getLowestAndHIghestSalary函数，它就会返回错误:

错误LNK2019:无法解析的外部符号“void__cdecl getData（class std::basic_ifstream&，class std::basic_string，double，int）”（？getdata@@yaxaav？$basic_ifstream@du？$char_traits@d@std@@@std@@v？$basic_string@du？$char_traits@d@std@@v？$allocator@d@2@@2@naah@z)在函数_main中引用

然后是LNK2020错误。我的理解是，这些类型的错误通常会启动一个级联，所以解决第一个错误通常会解决其余的错误，所以我将重点放在LNK2019上。据我所知，它不能识别我的函数定义。

我试过玩设置，将链接器子系统从控制台更改为windows，将配置类型从application（。exe）更改为dynamic library（。dll），以及将函数定义和声明放到头文件中，但仍然没有成功。

有人对如何让程序识别我的功能有什么想法吗？

代码:

#include <iostream>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;

void getData(ifstream&, string, double, int&);
double getAverage(double&, double&);
void getLowestAndHighestAvgSalary(double&, int&, int&);

int main(void) {
    ifstream inFile;
    string jobs[20];
    double salaryRange[20][2], avgSalary[20];
    int numJobs = 0, lowest_index = 0, highest_index = 0;
    char input;
    getData(inFile, jobs[20], salaryRange[20][2], numJobs);
    for (int i = 0; i < 19; i++) {
        avgSalary[i] = getAverage(salaryRange[i][0], salaryRange[i][1]);
    }
    getLowestAndHighestAvgSalary(avgSalary[20], lowest_index, highest_index);
    cout << "Would you like to output to console (a) or output file (b)?\n";
    cin >> input;
    if (input == 'a') {
        for (int i = 0; i < 19; i++) {
            cout << "The average salary of the " << jobs[i] << "is $" << avgSalary[i] <<endl;
        }
        cout << "\nThe lowest average salary is " << avgSalary[lowest_index] << " (" << jobs[lowest_index] << ")";
        cout << "\nThe highest average salary is " << avgSalary[highest_index] << " (" << jobs[highest_index] << ")";
    }
    else if (input == 'b') {
        ofstream outFile;
        outFile.open("job_stat.txt");
        for (int i = 0; i < 19; i++) {
            outFile << "The average salary of the " << jobs[i] << "is $" << avgSalary[i] << endl;
        }
        outFile << "\nThe lowest average salary is " << avgSalary[lowest_index] << " (" << jobs[lowest_index] << ")";
        outFile << "\nThe highest average salary is " << avgSalary[highest_index] << " (" << jobs[highest_index] << ")";
    }
    return 0;
}

void getData(ifstream& inFile, string jobs[], double salaryRange[][2], int& numJobs) {
    inFile.open("job_salaries.txt");

    for (int i = 0; i < 19; i++) {
        if (inFile.eof()) {
            break;
        }
        getline(inFile, jobs[i]);
        inFile >> salaryRange[i][0];
        inFile.ignore(3);
        inFile >> salaryRange[i][1];
        inFile.ignore(100, '\n');
        numJobs = i;
    }
}

double getAverage(double& lowSalary, double& highSalary) {
    double avgSalary;
    avgSalary = (lowSalary + highSalary) / 2;
    return avgSalary;
}

void getLowestAndHighestAvgSalary(double avgSalary[], int& lowest_index, int& highest_index) {
    highest_index = 0;
    lowest_index = 0;
    double temp = avgSalary[0];
    for (int i = 0; i < 19; i++) {
        if (avgSalary[i] > temp) {
            highest_index = i;
        }
    }
    for (int i = 0; i < 19; i++) {
        if (avgSalary[i] < temp) {
            lowest_index = i;
        }
    }
}