c++ programming problem

[voodoo]

something is wrong in my program....why that it only outputs (invalid gender)
can someone help me fix this program........i really need to finish my homework today....
i really need this program to run properly.....

this is the problem:





Rewrite the program developed below so that the function main is merely a collection of function calls. Your program should use the following functions.
a. Function openFiles: This function opens the input and output files, and sets the output of the floating-point numbers to two decimal places in a fixed decimal format with a decimal point and trailing zeros
b. Function initialize: This function initializes variables such as countFemale, countMale, sumFemaleGPA, and sumMaleGPA.
c. Function sumGrades: This function finds the sum of female and male students' GPA's
d. Function averageGrade: This function finds the average GPA for female and male students.
e. Function printResults: This function outputs the relevant results.
f. There can be no global variables. Use the appropriate parameters to pass information in and out of functions.

/* For research purposes and to better help students, the admissions office of your local university wants to know how well female and male students perform in certain courses. You receive a file that contains female and male student's GPA's for certain courses. Due to confidentiality, the letter code f is used for female students and m for male students. Every file entry consists of a letter code followed by a GPA. Each line has one entry. The number of entries in the file is unknown. Write a program that computes and outputs the average GPA for both female and male students. Format your results to two decimal places.
*/

#include<iostream.h>
#include<fstream.h>
#include<iomanip.h>

void main()
{
ifstream inData;
char gender;
float average_gpa, sum_gpa = 0, gpa;
int count = 0;

inData.open("GPA_Detail.dat");
if(!inData) {
cout<<"Cannot open input file. Program terminates!!!\n";
}

cout<<"Processing data...\n";
inData>>gender>>gpa;
count++;
while(!inData.eof()) {
sum_gpa += gpa;
inData>>gender>>gpa;
count++;
}

average_gpa = sum_gpa / count;
cout<<fixed;
cout<<"The average gpa is " <<setprecision(2) <<average_gpa<<".\n"

inData.close();
}


########################################################
for now.....this is my progress..pls help me....




#include <iostream>
#include <fstream>
#include <iomanip>
using namespace std;
void OpenFiles(char ch, float gpa);
void initialize(int fcount, int mcount, float fgpa, float mgpa);
void sumGrades( int fcount, int mcount, float fgpa, float mgpa);
void averageGrades(float avfgpa, float avmgpa);
void printResults(int fcount, int mcount, float avfgpa, float avmgpa);
int main()

{
ofstream out;
ifstream in;
char ch;
float gpa;
float avfgpa;
float avmgpa;
int fcount, mcount;
float fgpa; //define female GPA
float mgpa; //define male GPA

initialize (fcount, mcount, fgpa, mgpa);

OpenFiles(ch, gpa);

while(!in.eof())
{
sumGrades(fgpa,mgpa,fcount,mcount);
in>>ch>>gpa;
averageGrades(avfgpa, avmgpa);

}


printResults(fcount, mcount, avfgpa, avmgpa);

}

void OpenFiles(char ch, float gpa)
{

ofstream out;
ifstream in;
in.open("GPA_Detail.dat",ios::out | ios::ate);
if (!in)
{
cout<<"Can not open input file"<<endl;
cout<<"program terminates!!"<<endl;
}
in.get(ch);
in>>gpa;
in.eof();

out.open("GPA_Detail.dat",ios::out | ios::ate);
out<<fixed<<showpoint;
out<<setprecision(2);
//out<<"Female" <<ch<<endl;

}

void initialize(int fcount, int mcount, float fgpa, float mgpa)

{

fgpa = 0.0;
mgpa= 0.0;
fcount = 0;
mcount = 0;
}

void sumGrades(int fcount, int mcount, float fgpa, float mgpa)
{

char ch;
float gpa;
OpenFiles(ch, gpa);
switch (ch)
{
case 'F':
case 'f': fgpa = fgpa+gpa;
fcount++;
//avfgpa = fgpa/fcount;
break;
case 'M':
case 'm': mgpa = mgpa + gpa;
mcount++;
//avmgpa = mgpa/mcount;
break;
default: cout<<"invalid gender"<<endl;
return;
}

}

void averageGrades(float avfgpa, float avmgpa)
{

float fgpa, mgpa;
int fcount, mcount;
sumGrades(fcount, mcount, fgpa, mgpa);
avfgpa = fgpa/fcount;
avmgpa = mgpa/mcount;
}

void printResults(int fcount, int mcount, float avfgpa, float avmgpa)
{
ofstream out;
out<<"Number of female ="<<fcount<<endl;
out<<"Average female GPA = "<<avfgpa<<endl;
out<<"Number of male ="<<mcount<<endl;
out<<"Average male GPA ="<<avmgpa<<endl;
out.close();
}