Hi I am writing a program and i keep getting missing function header (old-style formallist?) can anyone tell me what i am doing wrong???

//Pre-Compiler Directives

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

//Constant Declerations

const float COSTperSQINCH= .50;
const float TOPPINGCOST= 1.25;
const float PI= 3.141592654;

{

float Compute CostTotalofPizza(int Diameterf, int NumberofToppingsf);
}

//Main Body

void main();

{
//Local Identifiers
int Diameter,NumberofToppings,CostofToppings;

cout<<"Please enter the diameter of the pizza you would like to purchase:\t";
cin>> Diameter;
cout<<"Please enter the number of toppings you would like on your pizza:\t";
cin>> NumberofToppings;

//Function Call
CostTotalofPizza=Compute CostTotalofPizza( Diameter, NumberofToppings)

//Output Module

cout<<"Diameter:\t"<<Diameter<<endl;
cout<<"Pizza Cost:\t"<<PizzaCost<<endl;
cout<<"Number of Toppings:\t"<<NumberofToppings<<endl;
cout<<"Total Cost:\t"<<TotalCost<<endl;
cout<<"The cost for a"<<Diameter<<"inch pizza"<<"with"<<NumberofToppings<<"toppings is $"<<
set percision(2)<<TotalCost<<".\n"<<endl;

return;

}

{

//Function Definition
float Compute CostTotalofPizza(Diameterf, NumberofToppingsf);

//Local Identifiers
float Radius, Area, PizzaCost, TotalCost;

Radius= float(Diameterf)/2;
PizzaCost= COSTperSQINCH*Area;
Area= PI*Radius*Radius;
CostofTopping= NumberofToppings*TOPPINGCOST;
TotalCost= TOPPINGCOST+TotalCost;

return TotalCost;

}

That code is very mangled.

Did you cut and paste correctly?