Two Errors in my functions that can't figure them out

Can anyone get the errors to go away for me, been trying for a week now. I am new to the programming world as you might tell from the format of it.
Thanks,
tomakated@comcast.net


any help that can be given that would be great< !!!.

#include <iostream>
#include <iomanip>

double findcheapest(double, double, double, double);
void printresults (double, double, double, double, double, double, double);
void instructions();
double get_item_price();
int getresponse();
char response;
int lowest;
int total;

int main()
{
double item1, item2, item3, item4, lowest=0, total;
char response;

instructions();
item1 = get_item_price();
item2 = get_item_price();
item3 = get_item_price();
item4 = get_item_price();
total = item1 + item2 + item3 + item4;
cout << "Do you have a coupon for this purchase? \n" ;
response = getresponse() ;
if (response == 'y')
{ lowest = findcheapest(item1, item2, item3, item4);
total = total - lowest;
}
printresults (response, item1, item2, item3, item4,
total, lowest);
}


double get_item_price()
{
double i;
cout << "Enter the four item prices you want to buy.";
cout << "Item1: ";
cin >> i;
while (i<0)
{
cout << "Please enter a positive number: ";
cin >> i;
}

return i;
}

int getresponse()
{
cout << "Do you have a coupon for this purchase? (y or n): .\n";
cin >> response;

if ((response == 'y') || (response == 'Y'))
{
lowest = findcheapest(double item1, double item2, double item3, double item4);
total = total - lowest;

if ((response == 'n') || (response == 'N'))
total = total;

}

double findcheapest(double item1, double item2, double item3, double item4)

{
if (((item1 <= item2) && (item1 <= item3) && (item1 <= item4)))
{
lowest = item1;
}
if (((item2 <= item1) && (item2 <= item3) && (item2 <= item4)))
{
lowest = item2;
}

if (((item3 <= item1) && (item3 <= item2) && (item3 <= item4)))
{
lowest = item3;
}

if (((item4 <= item1) && (item4 <= item2) && (item4 <= item3)))
{
lowest = item4;
}

}

void printresults(double response, double item1, double item2,
double item3, double item4, double total, double lowest)

{

cout << "Item 1 $" << setw(10) << item1 << endl;
cout << "Item 2 $" << setw(10) << item2 << endl;
cout << "Item 3 $" << setw(10) << item3 << endl;
cout << "Item 4 $" << setw(10) << item4 << endl;
cout << "Coupon Discount $(" << setw(10) << lowest<<")"<< endl;
cout << "----------------------------" << endl;
cout << "Total $" << setw(10) << total << endl;
}

"fourth.cpp" 102 lines, 2384 characters
$ g++ fourth.cpp -o fourth.out
fourth.cpp: In function `int getresponse()':
fourth.cpp:57: parse error before `,'
fourth.cpp:67: parse error before `{'
$
lowest = findcheapest(double item1, double item2, double item3, double item4); lowest = findcheapest(double item1, double item2, double item3, double item4); double findcheapest(double item1, double item2, double item3, double item4)

{

hi frnd,
1. The first error you have specified is "Parse Error before ," in
lowest = findcheapest(double item1, double item2, double item3, double item4);
This is where you call the function "findcheapest" .while calling the function you should not specify the data type.(here double).so after modification
lowest = findcheapest(item1, item2, item3, item4); and in the function findcheapest you have not used return statements. check that also.
2. Parse Error In fuction int getresponse() b'coz you have not closed the braces"}" . so do that.
mail me for more details.
I guess this may help you.
with Regards
aarthy.