Debugging problem

[Jp P]

Well the program is simple enough, I'm taking a list of numbers from a file, then finding the average, lowest, highest, ect.. however this compiler error is getting to me, here's the code:

#include<iostream>
#include<string>
#include<fstream>
#include<cstring>
#include <cstdlib>
using namespace std;

int average_temp(int nums[], int index);
int highest_temp(int nums[], int index);
int lowest_temp(int nums[], int index);
int temp_85(int nums[], int index);
void convert_celsius(int nums[], int index);


int main()
{
	ifstream inputFile;
	string filename;
    
    const int SIZE = 100;
	int array [SIZE];
	int count = 0; 

	int highest, lowest, greater_85, average;
	


	cout << "Enter the filename: ";
	cin >> filename;

	inputFile.open (filename.c_str());

	if (inputFile)
	{
		while(count < SIZE && inputFile >> array[count])
			count++;
			
		for(int i = 0; i <= count; i++)
			cout << array[i] << endl;
		
	}

	else 
	{
		cout << "Error opening the file.\n";
		return 0;
	}



			
	inputFile.close();



	cout << "They're are " << count << " values representing temperatures\n";
	cout << " in the file." << endl;

	average = average_temp(array, count);
	cout << "The average temperature is: " << average << endl;
	
	highest = highest_temp(array, count);
	cout << "The highest temperature is: " << highest << endl;
	
	lowest = lowest_temp(array, count);
	cout << "The lowest temperature is: " << lowest << endl;

	greater_85 = temp_85(array, count);
	cout << "They're are " << greater_85 << " temperatures over 85 degrees\n.";

	convert_celsius(array, count);



		
	
	
	return 0;
}

	


int average_temp(const int nums[], int index)
{
	int sum, average;


	for(int a = 0; a < index; a++)
	{
		sum += nums[a];
	}

	average = sum / index;

	return average;
}

int highest_temp(const int nums[], int index)
{
	int highest = 0;

	for(int b = 0; b < index; b++)
	{
		if(nums[b] > highest)
			highest = nums[b];
	}
	return highest;
}

int lowest_temp(const int nums[], int index)
{
	int lowest = 0;

	for(int c = 0; c < index; c++)
	{
		if(nums[c] < lowest) 
			lowest = nums[c];
	}
	return lowest;
}

int temp_85(const int nums[], int index)
{
	int counter = 0;

	for(int d = 0; d < index; d++)
	{
		if(nums[d] > 85)
			counter++;
	}
	return counter;
}

void convert_celsius(const int nums[], int index)
{
	ofstream outputFile;
	outputFile.open ("celsius.txt");
	int new_array [index];

	for(int e = 0; e < index; e++)
	{
		new_array[e] = (nums[e] - 32) * (5/9);
		outputFile << new_array[e];
	}

	outputFile.close();

	cout << "You're temperatures have been converted from Fahrenheit to Celsius.\n";
	cout << "The new values have been saved to file celsius.txt." << endl;
	
}

and the compiler error:

g++ temperature.cpp -o run
/tmp/cc0iLw2O.o: In function `main':
temperature.cpp:(.text+0x4d2): undefined reference to `average_temp(int*, int)'
temperature.cpp:(.text+0x51f): undefined reference to `highest_temp(int*, int)'
temperature.cpp:(.text+0x56c): undefined reference to `lowest_temp(int*, int)'
temperature.cpp:(.text+0x5b9): undefined reference to `temp_85(int*, int)'
temperature.cpp:(.text+0x606): undefined reference to `convert_celsius(int*, int)'
collect2: ld returned 1 exit status

any ideas? thanks!

[S G H]

simple: change from

int average_temp(int nums[], int index);
int highest_temp(int nums[], int index);
int lowest_temp(int nums[], int index);
int temp_85(int nums[], int index);
void convert_celsius(int nums[], int index)

to

int average_temp(const int nums[], int index);
int highest_temp(const int nums[], int index);
int lowest_temp(const int nums[], int index);
int temp_85(const int nums[], int index);
void convert_celsius(const int nums[], int index);

[Jp P]

Thanks man that did it! It's always the little mistakes that take the longest.