storing values. ARRAYS ETC

[clio78]

i am writing a program whereby i have written the instructions the shell of the program, and have written code for inputting values, but how do i collect all the information i have inputted. I am aware it involves arrays but can you help and point me in the right direction ?

Here is part of my program:

#include <iostream.h>
#include <string>
#include <conio.h>
main()
{
int salescode, bikeprice, modelcode, quantity;
   string date;
   char answer; //either yes or no


   do
        //the instructions to enter the i.d. code will be repeated (do...while
        //loop) as long as the salescode is less than 1 or greater than 20.
   	{

      	cout << "\n\nPlease enter your identifiction code ";
         cin >> salescode;

         //the condition is tested
         if (salescode < 1 || salescode > 20)

         	{
            	cout << ("\nTHIS I.D. CODE IS NOT VALID. TRY AGAIN \n");
            }
      }
	//the instructions to enter the i.d. code will be repeated (do...while
   //loop) as long as the salescode is less than 1 or greater than 20.
   while (1 > salescode || salescode > 20);

   //another do...while loop
   do
   	{
      	cout << "\nPlease enter the bike price (one unit = 1 Euro) ";
      	cin >> bikeprice;

         if (bikeprice < 1 || bikeprice > 500)

         	{
            	cout << ("\nINVALID PRICE. Bike prices cannot be 0 or more than 500. TRY AGAIN \n");
            }
      }

   while (bikeprice < 1 || bikeprice > 500);

   //another do...while loop
   do
   	{
      	cout << "\nPlease enter the 3 digit model code ";
      	cin >> modelcode;

         if (modelcode < 0 || modelcode > 999)

         	{
            	cout << ("\nINVALID MODEL CODE. TRY AGAIN \n");
            }
      }

   while (modelcode < 0 || modelcode > 999);

   //another do...while loop
   do
   	{
         cout << ("\nPlease enter the quantity sold ");
      	cin >> quantity;

         if (quantity < 1 || quantity > 10)

         {
         	cout << ("\nINVALID QUANTITY. TRY A NUMBER FROM 1-10 \n");
         }
      }

   while (quantity < 1 || quantity > 10);

	do {


			cout << "\nPlease enter the date in this format dd/mm/yyyy: ";
         cin >> date;

			cout << "\nIs this the correct date ?\t" << date << "\tpress y/n: \n\n";
         cin >> answer;   //gets answer from user

			switch (answer)	{
         	case 'y':
            	cout << "\n\n\nThank You!\n\n";
               break;
            }
         }while (answer != 'y');
   }

So if you run my program as it is, how do i store the values entered for each of the commands prompted ?

I will need these values to be used later on to calculate the weekly sales.

Any ideas please ?
oh yeah, if i type in any other non integer, the program crashes.
what would you suggest.

I am new to c++ and programming
Thanks

[m4ster r0shi]

Hi! Significant improvement to the size of your code can be achieved with the use of functions:

#include <iostream>
#include <string>

using namespace std;

int get_int(const char * prompt, const char * error, int min=INT_MIN, int max=INT_MAX);

int main()
{
    int salescode, bikeprice, modelcode, quantity;
    string date;
    char answer; //either yes or no

    salescode=get_int("Please enter your identification code: ",
        "THIS I.D. CODE IS NOT VALID. TRY AGAIN",1,20);

    bikeprice=get_int("Please enter the bike price (one unit = 1 Euro): ",
        "INVALID PRICE. Bike prices cannot be 0 or more than 500. TRY AGAIN",1,500);

    modelcode=get_int("Please enter the 3 digit model code: ",
        "INVALID MODEL CODE. TRY AGAIN",0,999);

    quantity=get_int("Please enter the quantity sold: ",
        "INVALID QUANTITY. TRY A NUMBER FROM 1-10",1,10);

    while (true)
    {
        cout << "Please enter the date in this format dd/mm/yyyy: ";
        cin >> date;

        cout << "Is this the correct date ?\t" << date << "\t(press y/n): ";
        cin >> answer;   //gets answer from user

        if (answer=='y') {cout << "Thank You!" << endl; break;}
    }

    return 0;
}

int get_int(const char * prompt, const char * error, int min, int max)
{
    int integer;

    while (true)
    {
        cout << prompt;
        cin >> integer;

        //if the user enters non-numeric input cin.good() returns 0, so !cin.good() evaluates to true
        //cin.get()!='\n' checks if the user enters "more" info than he is asked to...
        if (!cin.good() || cin.get()!='\n')
        {
            //clear cin so it can be used for input again
            cin.clear();

            //ignore every character until the end of line (including the newline character)
            while(cin.get()!='\n');

            cout << "please don't enter crap..." << endl;
            continue;
        }

        if (integer<min || integer>max)
        {
            cout << error << endl;
            continue;
        }

        break;
    }

    return integer;
}

Here I made a simple integer input function which also takes care of crap input (i.e. the user enters non-numeric data or tries to enter more than one integer values at once etc...) If you're not familiar with functions try taking a look here:

http://cplusplus.com/doc/tutorial/functions/
http://cplusplus.com/doc/tutorial/functions2/

So if you run my program as it is, how do i store the values entered for each of the commands prompted ?

To be honest I didn't quite get that one... Each value the user enters is stored in the corresponding variable. What exactly do you mean?...

[clio78]

ok, my variables in my program would be salescode, bikeprice, modelcode, quantity right ?

i could output these values.
But when the program is looped again and different values are entered as the values of variables the previous values will be "written over" and disappear.

i wanted to know how i could recall any values that might have been entered earlier.

u understand what i am trying to say ?

[m4ster r0shi]

Ok, I got it. If you know the number of iterations (i.e. how many times the loop will run) in compilation time, let's say it's n (where n is a (literal) constant), use an array with n elements for each variable. If you don't know this number use vectors and push_back the newly inputted values in each iteration.

Info on arrays -> http://cplusplus.com/doc/tutorial/arrays/
Info on vectors -> http://cplusplus.com/reference/stl/vector/