Thread: Problems with Looping

= is for assignment, == for comparison

I wrote the program and it works perfectly, but there's a catch.

Code:

#include <iostream.h>
#include <string>
using namespace std;

int main()
{
	string date;
   char answer; //either yes or no
   bool check;

  do{cout << "\nplease enter the date in dd/mm/yyyy: "; cin >> date; cout << "\nIs this the correct date ? press y/n \n" << date << "\n\n";  cin >> answer; if (answer == 'y'){ cout << "\nThank you!!\n"; break; } else if (answer != 'n' && answer != 'y') { cout << "invalid input\n"; } } while (answer == 'n' && answer != 'n' || answer != 'y'); system ("pause"); return 0;
}

i got it to loop and put it in my program, (right at the end. last 7 lines)...

but, i have a problem. When a non integer is inputted, the program crashes.
how do i get around this ?

Code:

#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');
   }

Shouldn't those be AND operators? saying OR means that only on side has to be true for it to continue.

Originally Posted by fadlan12

Shouldn't those be AND operators? saying OR means that only on side has to be true for it to continue.

nope, does not work.
a number cannot be smaller than 1 AND bigger than 10

As to the actual question you asked, have you read the FAQ yet, particularly Cprogramming.com FAQ > Convert a string to a int (C++) ?

Originally Posted by tabstop

As to the actual question you asked, have you read the FAQ yet, particularly Cprogramming.com FAQ > Convert a string to a int (C++) ?

the thing is, my compiler does not recognize the language.
Unfortunately, we HAVE to use borland c++ 5.02 !
Any idea how to stop the program from crashing when a non character is inputted ? - in regards to my program preceding this reply ?
thanks

Which part doesn't it recognize?

You can't use >> by definition since that will not read in a character.

Originally Posted by tabstop

Which part doesn't it recognize?

You can't use >> by definition since that will not read in a character.

Info :Compiling E:\program\noname00.cpp
Error: noname00.cpp(1,2):Unable to open include file 'SSTREAM.h' ??????????????
Warn : STRING.h(549,3):Functions containing for are not expanded inline
Warn : STRING.h(557,3):Functions containing while are not expanded inline
Warn : STRING.h(563,3):Functions containing for are not expanded inline
Warn : STRING.h(575,3):Functions containing for are not expanded inline
Warn : string.cc(686,32):Comparing signed and unsigned values
Error: noname00.cpp(37,25):Undefined symbol 'istringstream' ??????????
Error: noname00.cpp(37,25):Statement missing ; ?????????????
Error: noname00.cpp(39,17):Undefined symbol 'myStream' ???????
Warn : noname00.cpp(43,2):Parameter 's' is never used
Warn : noname00.cpp(43,2):Parameter 'i' is never used