[quote=chiam dar siang,Dec 3 2009, 03:23 PM]
[QUOTE]#include<iostream>
#include<iomanip>
using namespace std;
double sum;
int code;
char answer;
double total=0;
double price;
int quantity;
double pay_amount;
string name;

double total1()
{

total = quantity*price;
return total;
}

double sum1()
{
sum = total;
return sum;
}
int main()
{
do
{
cout<<"enter item: ";
cin>>name;
cout<<"enter code: ";
cin>>code;
cout<<"enter quantity: ";
cin>>quantity;
cout<<"enter price: ";
cin>>price;

cout<<"Items"<<setw(10)<<"Code"<<setw(10)<<"Quantity"<<setw(10);
cout<<"Price"<<setw(10)<<"Total"<<endl;
cout<<name<<setw(10)<<code<<setw(10)<<quantity<<setw(10)<<price<<setw(10)<<total1()<<endl;
cout<<"continue?";
cin>>answer;
}
while(answer=='y');
{
cout<<"please pay:"<<sum1()<<endl;

}
system("pause");
return 0;
}
how to get the sum??
am i do wrongly on the declaration part?

[/quote]

while(answer=='y') {....}

int main()
{
double sum;
int code;
char answer;
double total=0;
double price;
int quantity;
double pay_amount;
string name;
.....
}

cout<<"please pay:"<<sum1()<<endl;

double total1(int quantity, double price)
{
return quantity*price;
}

double sum1(double sum, double total)
{
sum+=total;
return sum;
}

cout << total1(quantity, price)