I found this answer on the site and it does not compile, does anyone know why? H

Question

I found this answer on the site and it does not compile, does anyone know why? Here is a copy of the code:

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

struct student
{
string name;
int score;
};

float Average(student *, int number);
void SortTestScores(student *, int number);

int main()
{
struct student *scores, *temp;
float averageScore =0;

int number,i;

cout<<"Enter number of test scores";
cin>> number;

scores= new student[number];

temp=scores;

cout<<"Enter test scores: "<<endl;

for(i=0; i<number; i++)
{
cout<<"Enter name and score: ";
cin>>temp->name;
cin>>temp->score;
temp++;
}

SortTestScores(scores, number);

cout<<"Sorted test scores: "<<endl;
temp= scores;
for(i=0; i<number; i++)
{
cout<<temp->name<<" "<<temp->score<<endl;
temp++;
}

averageScore= Average(scores, number);

cout<<"Average test score is: "<<averageScore<<endl;

return 0;
}

Explanation / Answer

The VS2010 compiler gives unresolved externals error, because functions are not defined. Try this code. here I defined average function, and sorting function using insertion sort. Use step-by-step debugging in VS to see how it works.

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

struct student
{
string name;
int score;
};

float Average(student *scoreA, int number)
{
float result = 0;

for (int i = 0; i < number; i++)
result += scoreA[i].score;

return (result/number);
}

void SortTestScores(student *scoreA, int number)
{
student key;
int j;

for (int i = 1; i < number; i++)
{
key = scoreA[i];
j = i - 1;

while (j >= 0 && scoreA[j].score > key.score)
{
scoreA[j+1] = scoreA[j];
j--;
}

scoreA[j+1] = key;
}
}

int main()
{
student *scores, *temp;
float averageScore = 0;

int number, i;

cout << "Enter number of test scores";
cin >> number;

scores = new student[number];
temp = scores;

cout<<"Enter test scores: "<<endl;

for(i = 0; i < number; i++)
{
cout<<"Enter name" << i+1 <<": ";

cin>>temp->name;

cout<<"Enter score" << i+1 <<": ";

cin>>temp->score;

temp++;

}

SortTestScores(scores, number);

cout<<"Sorted test scores: "<<endl;
temp = scores;

for(i = 0; i < number; i++)
{
cout<<temp->name<<" "<<temp->score<<endl;
temp++;
}

averageScore = Average(scores, number);
cout<<"Average test score is: "<<averageScore<<endl;

return 0;
}

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