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Apple mach-o linker (id) error

cheagle5 (12)
whenever i compile this code, it gives me 4 errors and won't build
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#include <iostream>
#include <fstream>
using namespace std;

string contestantName(ifstream&);
int getJudgeData();
void calcScore(ofstream&, string ,int ,int, int, int, int);
double findLowest(int, int, int, int, int);
double findHighest(int, int, int, int, int);

int main(int argc, const char * argv[])
{
    ifstream inFile;
    inFile.open("starsearch.docx");
    
    ofstream outFile;
    outFile.open("results.docx");
    
    int number;
    inFile >> number;
    
    for (int count = 1; count <= number; count ++)
    {
        string name = contestantName(inFile);
        int score1 = getJudgeData();
        int score2 = getJudgeData();
        int score3 = getJudgeData();
        int score4 = getJudgeData();
        int score5 = getJudgeData();
        
        calcScore(outFile, name, score1, score2, score3, score4, score5);
     
    }
   
    inFile.close();
    outFile.close();
    return 0;
}

string contestantName(ifstream& inFile)
{
    string name;
    inFile >> name;
    return name;

}

int getJudgeData(int &score, ifstream& inFile)
{
    inFile >> score;
    return score;
}
void calcScore(ofstream& outFile,string name, int score1,int score2,int score3,int score4,int score5)
{
    double lowScore = findLowest(score1, score2, score3, score4, score5);
    double highScore = findHighest(score1, score2, score3, score4, score5);
    double average = (score1 + score2 + score3+ score4 + score5 - lowScore - highScore)/3;
    outFile << name << "\t" << average << endl;

}

double findLowest(int score1, int score2, int score3,int score4, int score5)
{
    int lowScore = score1;
    if (score2 < lowScore)
        lowScore = score2;
    if (score3 < lowScore)
        lowScore = score3;
    if (score4 < lowScore)
        lowScore = score4;
    if (score5 < lowScore)
        lowScore = score5;
    return lowScore;
}

double findHighest(int score1, int score2, int score3, int score4, int score5)
{
    int highScore = score1;
    if (score2 > highScore)
        highScore = score2;
    if (score3 > highScore)
        highScore = score3;
    if (score4 > highScore)
        highScore = score4;
    if (score5 > highScore)
        highScore = score5;
    return highScore;


}

what am i doing wrong?
cheagle5 (12)
these 4 errors

"findLowest()", referenced from:


calcScore(std::__1::basic_ofstream<char, std::__1::char_traits<char> >&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, int, int, int, int, int) in main.o


"findHighest()", referenced from:


calcScore(std::__1::basic_ofstream<char, std::__1::char_traits<char> >&, std::__1::basic_string<char, std::__1::char_traits<char>, std::__1::allocator<char> >, int, int, int, int, int) in main.o


"getJudgeData()", referenced from:


_main in main.o


ld: symbol(s) not found for architecture x86_64


clang: error: linker command failed with exit code 1 (use -v to see invocation)


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