getchar() problem. Read other threads.

I have read other threads and it helped me solve my problem sort of. Can someone please tell me why I had to add two getchar(); in my code in order for it to work. I took the Source code and compilied it in both windows and linux then ran it and got the same results.

/********************************
* FileName: cbcalc.c            *
*                               *
* Purpose: Caluclate checkbook  *
*                               *
* Author: Josh Stephens         *
*                               *
* Date Created: 10/18/2005      *
*                               *
* Revision: 1.0                 *
********************************/

#include <stdio.h>

int main()
{
   float starting_balance;  //Balance Currently in checkbook
   float trans_amount;      //Amount Transaction Was For
   float ending_balance;    //Amount after Transaction takes place
   char trans_type;         //(D) for Deposit and (W) for Withdraw

   // Module 1. Get information From Users

      printf("Please enter your starting balance:\t$");
      scanf("%f",&starting_balance);

      printf("Please enter (D) for Deposit and (W) for withdraw:\t");
      scanf("%s",&trans_type);

      printf("Please enter your Amount for Transaction:\t$");
      scanf("%f",&trans_amount);

  // Module 2. Take input and make decision then calculate based on transaction type

     if(trans_type == 'D')
	{
	  ending_balance = starting_balance + trans_amount;
	}
     else
	{
	  ending_balance = starting_balance - trans_amount;
	}

  // Module 3. Print information Back to user 

        printf("Your new balance is now: \t$%.2f",ending_balance);
        printf("\nPress any Key to quit!");
	getchar();
	getchar();
        return(0); 
}

Thanks for all the help. I am very new to programming in C.

I've looked through your code and I fail to see where you're calling getchar()??

Maybe you could include more of your source file with a specific example of its usage?

Thanks.
Mistro116

There was no real big reason. I justed wanted to let the user know that the program was finished.

Well your usage for this would be incorrect:

If I was writing this, I would do something like:

printf("\nPress any Key to Quit!\n\n");

if (getchar() != NULL)
{
exit (-1);
}

exit can be found in the stdlib.h library, so just #include <stdlib.h> in your programs.

Hope this helps.
Mistro116