C++ hw need help..

I cant figure out how to fix the loop for the program to work correctly and for it to display right..Please
help..

DrinkMachineInventory.txt-
Coca-Cola 0.75 20
Root Beer 0.75 20
Sprite 0.75 20
Spring Water 0.80 20
Apple Juice 0.95 20

Code:

---

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

struct Machine
{
    string name;
    double cost;
    int num;
};

void init(Machine []);
int menu(Machine[]);
void payment(double);

int main()
{
    Machine drink[5];
    int choice;
    double made=0;
    init(drink);
    choice=menu(drink);
    while(choice!=5)
    {
        payment(drink[choice].cost);
        made+=drink[choice].cost;
        drink[choice].num--;
        choice=menu(drink); 
    }
    cout<<"Today the machine has made $"<<setprecision(2)<<fixed<<made<<endl;
    system("pause");
    return 0;
}

void payment(double p)
{
    double pay;
    cout<<"Your drink costs $"<<setprecision(2)<<fixed<<p<<endl;
    cout<<"Enter payment: ";
    cin>>pay;
    while(pay<0||pay>1.||pay<p)
    {
        cout<<"please insert the correct amount for your drink!\n";
        cout<<"maximum payment is $1.00\n";
        cout<<"Enter payment: ";
        cin>>pay;
    }
    cout<<"Your change is: $"<<setprecision(2)<<fixed<<pay-p<<endl;
    return;
}

void init(Machine d[])
{
    ifstream infile("DrinkMachineInventory.txt");

    if(infile.fail())
    {
        cout << "Could not find the file DrinkMachineInventory.txt \n";
        cout << "Exiting the program\n";
        exit(0);
    }

    int i=0;
    char ch;
    string word= "";

    while(!infile.eof())
    {
        word= "";
        ch = infile.get();
        while(true)
        {
            if(isdigit(ch) || ch == '\n')
                break;
            else
                word += ch;
            ch = infile.get();
        }

        if(word != "")
        {
            d[i].name = word;
            infile >> d[i].cost >> d[i].num ;
            i++;
        }
    }

    infile.close(); 
}

int menu(Machine d[])
{
    int choice=8,i;
    bool soldout=true;
    while((choice<1||choice>6)||soldout)
    {
        soldout=false;
        cout<<"Menu\n";
        cout<<"      Drink      Cost\tleft\n";
        for(i=0;i<5;i++)
        {
            cout<<i+1<<". "<<setw(17)<<left<<d[i].name<<"\t";
            cout<<setprecision(2)<<fixed<<d[i].cost<…
        }
        cout<<"6. Exit\n";
        cout<<"Enter Choice ";
        cin>>choice;
        if(choice<1||choice>6)
            cout<<"invalid entry\n";
        else
            if(d[choice-1].num==0)
            {cout<<"sold out\n";
        soldout=true;
        }
    }
    return choice-1;
}

---

Your init loop could be simplified to
infile >> name >> cost >> stock;

Also, using eof as a loop condition is bad. eof returns true only when an attempt to read past the end of the file has occurred. That is to say, eof will return false after having read the last line, and will return true on the next loop when trying to read a non-existing line.
See FAQ for more details.

Avoid passing around arrays, since they are vulnerable to buffer overruns. Suggest you use std::array or std::vector if allowed.

You haven't told us what the actual problem is either.