Question

I am receiving an "undefined reference to" build error in my code that i do not know how to fix.

Here is my main code in C++ (the line of code that is in question is in bold):

#include <iostream>
#include<iomanip>
#include<stdio.h>
#include<stdlib.h>
using namespace std;

//Prototypes of functions
void sortTestScores(int*testScores,int size);
double averageTestScore(int*testScores,int size);
void printTestScores(int*testScores, int size);

int main()
{
//variable declaration
int *testScores;
int size;
int score;
double average;

//Prompt to enter size of array
cout<<"Enter size of array: ";
cin>> size;

testScores=new int[size];
//prompt to enter scores into array
cout<<"\nEnter "<<size
<<" positive values for the test scores"
<<endl;
for(int i=0;i<size;i++)
{
//prompt to enter a test score
cout<<"Score "<<(i+1)<<": ";
cin>>score;
//If negative score is entered
while(score<0)
{
cout<<"Again: " <<(i+1)<<": ";
cin>>score;
}
//stores score into array
testScores[i]=score;
}
//Print test scores before sorted
cout<<"\nTest scores before sorting: ";
printTestScores(testScores, size);
sortTestScores(testScores, size);

cout<<"Test scores after sorting: ";
printTestScores(testScores,size);

//Average test scores
average=averageTestScore(testScores, size);
//print average test scores
cout<<"Average test score: "<<setprecision(2)
<<fixed<<average<<endl;
//pause system
cout<<endl;
system("pause");
return 0;
}

----Here is my build log:

-------------- Clean: Debug in Module 9 (compiler: GNU GCC Compiler)---------------

Cleaned "Module 9 - Debug"

-------------- Build: Debug in Module 9 (compiler: GNU GCC Compiler)---------------

mingw32-g++.exe -Wall -fexceptions -g -c "C:\Users\Bewm\Desktop\Computer Science 139\Module 9\main.cpp" -o obj\Debug\main.o
mingw32-g++.exe -o "bin\Debug\Module 9.exe" obj\Debug\main.o   
obj\Debug\main.o: In function `main':
C:/Users/Bewm/Desktop/Computer Science 139/Module 9/main.cpp:54: undefined reference to `averageTestScore(int*, int)'
collect2.exe: error: ld returned 1 exit status
Process terminated with status 1 (0 minute(s), 0 second(s))
2 error(s), 0 warning(s) (0 minute(s), 0 second(s))

Answer 1

#include <iostream>
#include<iomanip>
#include<stdio.h>
#include<stdlib.h>
using namespace std;

//Prototypes of functions
void sortTestScores(int*testScores,int size);
double averageTestScore(int*testScores,int size);
void printTestScores(int*testScores, int size);

int main()
{
//variable declaration
int *testScores;
int size;
int score;
double average;

//Prompt to enter size of array
cout<<"Enter size of array: ";
cin>> size;

testScores=new int[size];
//prompt to enter scores into array
cout<<"\nEnter "<<size
<<" positive values for the test scores"
<<endl;
for(int i=0;i<size;i++)
{
//prompt to enter a test score
cout<<"Score "<<(i+1)<<": ";
cin>>score;
//If negative score is entered
while(score<0)
{
cout<<"Again: " <<(i+1)<<": ";
cin>>score;
}
//stores score into array
testScores[i]=score;
}
//Print test scores before sorted
cout<<"\nTest scores before sorting: ";
printTestScores(testScores, size);
sortTestScores(testScores, size);

cout<<"Test scores after sorting: ";
printTestScores(testScores,size);

//Average test scores
average=averageTestScore(testScores, size);
//print average test scores
cout<<"Average test score: "<<setprecision(2)
<<fixed<<average<<endl;
//pause system
cout<<endl;
system("pause");
return 0;
}
void sortTestScores(int *values,int numValues){
   int i, j;
       int temp;
       // outer loop to travel through the all elements
       for (i = 0; i < numValues - 1; i++) {
           // inner loop to compare the outer loop elements
          
           for (j = 0; j < numValues - i - 1; j++)
               // if element at j< than j+1 than swap both
               if (values[j] > values[j + 1]) {
                   // swap logic
                   temp = values[j];
                   values[j] = values[j+1];
                   values[j+1] = temp;
               }
      
       }
}

double averageTestScore(int*testScores,int size){
double sum=0;
for(int i=0;i<size;i++)
sum+=testScores[i];
double avg=sum/size;
return avg;
}
void printTestScores(int*testScores,int size){
for(int i=0;i<size;i++)
cout<<testScores[i]<<" ";
cout<<endl;
}

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