local function definitions are illegal...help plz

okay so I tried your suggestion, and I fixed a few small issues with quotation marks but my code still won't compile properly. It appears to be something wrong with the way I am using my user defined function. Here is my code again:

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

void Swap(float&, float&);
float FloatSum (float, float, float);
float FloatProduct (float, float, float);
float FloatAverage (float, float, float);
void FloatSort (float&, float&, float&);

void main(){

float a, b, c;
int option;

cout<<endl;
cout << "Options:\n"; //output statements for menu choices
cout << "------\n";
cout << "1. Sum\n";
cout << "2. Product\n";
cout << "3. Average\n";
cout << "4. Sort\n";
cout << "5. Exit\n";
cout << "Enter your choice: ";
cin >> option;
cout << endl;

while(option != 0){

switch(option)
{
case 1:
cout << "Enter 3 float values: ";
cin >> a >> b >> c;
FloatSum(a, b, c);
cout << "The sum of the numbers = " << FloatSum(a, b, c) << endl;

case 2:
cout << "Enter 3 float values: ";
cin >> a >> b >> c;
cout << "The product of the numbers = " << FloatProduct(a, b, c) <<endl;

case 3:
cout << "Enter 3 float values: ";
cin >> a >> b >> c;
cout<<"The average of the numbers = "<< FloatAverage(a ,b ,c) <<endl;

case 4:
cout << "Enter 3 float values: ";
cin >> a >> b >> c;

case 5: (a <0 ||b <0 || c<0);
cout<<"Error!! Please enter positive integers only";
cout<<"Enter 3 float values: ";
cin >> a >> b >> c;

FloatSort(a, b ,c);
cout << "The numbers in order:"<< c <<" "<< b <<" "<< a <<endl;
}
if(option != 5) {

cout << "DONE!" << endl;
}


cout << endl;
cout << "Options:\n" << "----- \n" << "1. Sum \n";
cout << "2. Product \n" << "3. Average \n";
cout << "4. Sort \n" << "5. Exit \n";
cout << "Enter your choice: ";
cin >> option;
cout << endl;


}

//function definitions:

//*****************************************************************
float FloatSum (float a1,float b2,float c3){

float sum;
sum = a1 + b2 + c3;

return sum;
}

float FloatProduct( float a, float b, float c){

float product;
product = a * b * c;

return product;
}

float FloatAverage( float a, float b, float c){

float average;
average = (FloatSum(a, b, c)) / 3;

return average;
}

void FloatSort( float& a, float& b, float& c){

Swap(a,b);
Swap(b,c);
Swap(a,c);
}

void Swap(float& a, float& b){
float temp;
if (b > a){
temp=a;
a=b;
b=temp;
}
}

Here is there output when I try to compile, by the way I am using Visual C++ 2005:

1>-- Build started: Project: Assignment3_2, Configuration: Debug Win32 --
1>Compiling...
1>Assignment3_2.cpp
1>c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(87) : error C2601: 'FloatSum' : local function definitions are illegal
1> c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(18): this line contains a '{' which has not yet been matched
1>c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(95) : error C2601: 'FloatProduct' : local function definitions are illegal
1> c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(18): this line contains a '{' which has not yet been matched
1>c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(103) : error C2601: 'FloatAverage' : local function definitions are illegal
1> c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(18): this line contains a '{' which has not yet been matched
1>c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(112) : error C2601: 'FloatSort' : local function definitions are illegal
1> c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(18): this line contains a '{' which has not yet been matched
1>c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(120) : error C2601: 'Swap' : local function definitions are illegal
1> c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(18): this line contains a '{' which has not yet been matched
1>c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(128) : fatal error C1075: end of file found before the left brace '{' at 'c:\users\ch0sen\desktop\cosc labs\assignment3_2\assignment3_2\assignment3_2.cpp(18)' was matched
1>Build log was saved at "file://c:\Users\ch0sen\Desktop\COSC Labs\Assignment3_2\Assignment3_2\Debug\BuildLog.htm"
1>Assignment3_2 - 6 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
]

any idea's? thanks again i really appreciate it

If you're writing your code in an IDE (as opposed to a plain text editor) there's almost always a feature for displaying 'matching' brackets. Mismatched brackets is such a common programming mistake that all decent IDEs have some easy means of checking them. Tell us what IDE you use and someone will probably be able to explain how to do it in your IDE.

May I suggest using more consistent indentation? It'll make everything easier.

Also, opening and closing brackets placement.
Long time ago with 13 monitor, number of visible lines per screen was really important. That is why most of programmers used following bracket placement:void function() {
body. . .
}Now monitors are much bigger and placement like this:void function()
{
body. . .
}makes opening and closing brackets much easier to locate and match.
Indents in code is also very important; it makes blocks of code much easier to manage.

I agree. It seems more and more people are using that crazy first notation. I find that very hard to read easily.

Line up the braces and it's easy to see if one's missing and which one matches what.