Help with function

[jwah03]

I keep getting an error that says
hospital_JamesWah.cpp:4: error: expected initializer before "void"

  #include <iostream>
using namespace std;
void Instructions()
void Days()
void MedCharge()
void SurCharge()
void LabFees()
float ComputeRoomCharge(int, int)
float ComputeMiscell(float,float,float)
float ComputeTotalCharge(int,int,float,float,float)
void Result()
int main()
{
  int a=450,RoomCharge;
  float Miscellaneous,TotalCharge;
  //Function Calls
  Instructions();
  Days();
  MedCharge();
  SurCharge();
  LabFees();
//Prompt and read the medication charges
void MedCharge()
{
  float Medcharge;
  cout<<"Enter the medication charges:"<< endl;
  cin>>Medcharge;
}
//Prompt and read the surgical charges
void SurCharge()
{
  float SurCharge;
  cout<<"Enter the surgical charges:"<< endl;
  cin>>SurCharge;
}
//Prompt and read the lab fees
void LabFees()
{
  float LabFees;
  cout<<"Enter the lab fees:"<<endl;
  cin>> LabFees;
}
//Calculate the room charge
float ComputeRoomCharge(int a,int b)
{
  int  Result;
  Result=a*b;
  return Result;
}
//Calculate the Miscellaneous charge
float ComputeMiscellCharge(float A,float B,float C)
{
  float Result1;
  Result1= A+B+C;
  return Result1;
}
//Calculate the total Charge
float ComputeTotalCharge(int a,int b,float c,float d,float e)
{
float Result2;
Result2= a*b+c+d+e;
return Result2;
}

[J4ke]

Remember to add semicolons after all statements and declarations! Also, remember to close all braces (Specifically the one for the main function)