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Help With Simple Functions? Please Help me!

PL285 (33)
Hello, I am having trouble figuring out how to make these functions. I basically need a member function that will compute the total food needed for a zoo by type of animal. This is the data and program I have so far. The data displayed represents animal species ( 1 - 10 ) and then the amount of food each animal eats. How would I write a function to represent and return the total food needed for each species? Thanks for the help!

** NOTE this is what I have so far, I know it's not right because I don't know how to return all of the species. Please show me how I would do this, I really appreciate the help!

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1	40
1	45
1	40
1	45
2	30
2	28
2	32
3	55
3	60
3	65
4	80
4	85
4	90
5	120
5	110
5	105
6	240
6	290
6	325
7	220
7	220
7	220
8	300
8	325
9	200
9	200
9	200
9	210
10	40
10	42
10	44
10	44
10	40
10	25
10	25



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




class ZooClass
{
public:
	int compute_total_food();
	int total_food_by_type();
	int count_animals_by_type();
	int hungriest_animal();
	void load_animals_cinci(string filename);
	void load_animals_san_diego(string filename);

	/*
	using namespace san_diego;
	{
		void summary_food_report();
	}
	
	using namespace cincinnati;
	{
		void summary_food_report();
	}
*/
	
private:

	ifstream infile;
	
	struct animal
	{
		int type;
		int food;
	}  zoo[100];
	
};


int main()
{
ZooClass Cincinnati, San_Diego;

Cincinnati.load_animals_cinci("cincinnati.animals");

cout << "The total pounds of food needed for the Cincinnati Zoo is: " << Cincinnati.compute_total_food() << "\n";
cout << "The hungriest animal was " << Cincinnati.hungriest_animal();
//Cincinnati.count_animals_by_type();
}

void ZooClass::load_animals_cinci(string filename)
{
	for(int i = 0; i < 100; ++i)
    {
        zoo[i].type =0; zoo[i].food=0;
    }
	
int ofst = 0;

	infile.open("cincinnati.animals");
	if ( infile.fail() )
	{
		cerr << "cannot open infile input file\n\n";
		exit(1);
    }

	while(infile >> zoo[ofst].type)
	{
		infile >> zoo[ofst].food;
		ofst++;
	}
	
}


void ZooClass::load_animals_san_diego(string filename)
{
	for(int i = 0; i < 100; ++i)
    {
        zoo[i].type =0; zoo[i].food=0;
    }
	
int ofst = 0;

	infile.open("san_diego.animals");
	if ( infile.fail() )
	{
		cerr << "cannot open infile input file\n\n";
		exit(1);
    }

	while(infile >> zoo[ofst].type)
	{
		infile >> zoo[ofst].food;
		ofst++;
	}
	
}
	
int ZooClass::compute_total_food()
{
	int total = 0;
	
		for(int i = 0; i < 100; i++)
		{
			total += zoo[i].food;
		}
			return(total);
	
}

int ZooClass::hungriest_animal()
{
int hungriest;

    hungriest = zoo[0].food;
    for (int i = 0; i < 100; i++ )
    {
	if ( zoo[i].food > hungriest ) hungriest = zoo[i].food;
	}
	
	return(hungriest);
}	

int ZooClass::total_food_by_type()

int total_ones, total_twos, total_threes, total_fours, total_fives, total_sixes, total_sevens,
total_eights, total_nines, total_tens = 0;

for(int i = 0; i < 100; i++)
{
	if (zoo[i].type == 1)
	{
		total_ones += zoo[i].food;
	}
	if (zoo[i].type == 2)
	{
		total_twos += zoo[i].food;
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