My last resort! A grocery list program...

Sixjokercardz (3)
Hello! I've been working on this program for quite some time now... and I still can't get it right! I've tried many different things, but there's always an issue. My issue; displaying the infile input in a way that clears the "____" after each word and "presses" enter, instead of it all being on one line. At the moment, my problem is when I press "3," it just freezes and does nothing until I close the program. I thought maybe it was because I was using for loops (I've used them before in another program, and had to remove them by using while loops, making the program work. No idea what was wrong but oh well...) so I have while loops in the "listView()" function. I started to learn C++ about a year and half ago, so be gentle! Here's my code...

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#include <iostream>
#include <fstream>
#include <string>
#include <vector>

using namespace std;
void listCreate();
void listAdd();
void listView();
void listPrint();
int main()
{
    cout << "Eric's Grocery List!\n";
    int a = 1;
    do
    {   
    cout<<"\n";
    cout<<"1 - Create a list\n";
    cout<<"2 - Add to an existing list\n";
    cout<<"3 - View an existing list\n";
    cout<<"4 - Print an existing list\n";
    cout<<"5 - Exit\n";
    
    cin>>a;
    
    switch (a)
    {
           case 1:
                listCreate();
                break;
           case 2:
                listAdd();
                break;
           case 3:
                listView();
                break;
           case 4:
                listPrint();
                break;
           case 5:
                cout<<"Closing...\n";
                return 0;
           default:
                   cout<<"ERROR! Enter a number 1-5...\n";
                   break;
    }
    }
    while (a != 5);
    return 0;
}

void listCreate()
{
     ofstream outfile;
     outfile.open("list.txt", ios::out);
     if (outfile)
     {
                 cout << "Enter your item(s)...\n";
                 cout << "Type \"end\" when finished...\n";
                 int i = 0;
                 string input = " ";
                 while (i != 500 && input != "end")
                 {
                       cin >> input;
                       if (input != "end")
                       {
                                 outfile << input;
                                 outfile << "____";
                                 i++;
                       }
                 }
                 outfile.close();
     }
     else
     {
         cout << "There was an error opening the file...\n";
     }
}

void listAdd()
{
     ofstream outfile;
     outfile.open("list.txt", ios::app);
     if (outfile)
     {
                 cout << "Enter your item(s)...\n";
                 cout << "Type \"end\" when finished...\n";
                 int i = 0;
                 string input = " ";
                 while (i != 500 && input != "end")
                 {
                       cin >> input;
                       if (input != "end")
                       {
                                 outfile << input;
                                 outfile << "____";
                                 i++;
                       }
                 }
                 outfile.close();
     }
     else
     {
         cout << "There was an error opening the file...\n";
     }
}
                                               
void listView()
{
     ifstream infile;
     infile.open("list.txt", ios::in);
     if (infile)
     {
                string input;
                infile >> input;
                vector<string> list;
                while (input.find("____"))
                {
                      string word;
                      char letter;
                      int f = 0;
                      string::iterator iList;
                      int pos1 = input.find("____");
                      int pos2 = pos1 - 1;
                      iList = input.begin();
                      while (iList < input.end())
                      {
                          while (f < pos2)
                          {
                                letter = *iList;
                                if (letter == '_')
                                {
                                           break;
                                }
                                else
                                {
                                    word = word + letter;
                                    f = f++;
                                }
                          }
                          iList = iList++;
                      }
                      list.push_back(word);
                      input.erase(0, (pos2 + 4));              
                }
                int size = list.size();
                int i = 0;
                while (i < size)
                {
                    cout << list[i] << endl;
                    i = i++;
                }
                infile.close();
     }
     else
     {
         cout << "There was an error opening the file...\n";
     }
}

void listPrint()
{
}
Last edited on
Sixjokercardz (3)
I don't want someone to baby me and go step by step... but a push in the right direction would be a dream come true!
cire (8284)
while (input.find("____"))

The only time find will return something that evaluates to false is when the substring occurs at the very beginning of input.

std::string::find() returns string::npos when the substring is not found.
Sixjokercardz (3)
Okay, thank you very much. I'll look for something else to use then.
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