Thread: How to calculate minimum balance in simple banking system

Hi all,

I'm fairly new to this forum, but I have read the homework policy and I believe that the following question is within the guidelines.

I'm trying to figure out how to store and print the minimum balance for an account. It gets confusing since I'm not allowed to use functions and arrays. This is my code for the banking system thus far:

Code:

#include <stdio.h>
#include <stdlib.h>

int main(void) {
    
    float balance = 2000.00, deposit, withdrawal, credit, debit;
    int choice;
    
    printf("Your current balance is $&#37;.2f \n\n", balance);
    printf("Transaction options: \n\n");
    printf("1 - Deposit funds (credit transaction) \n");
    printf("2 - Withdraw funds (debit transaction) \n");
    printf("3 - Print statement of account \n");
    printf("4 - Compute interest and exit \n\n");
    printf("Please indicate your option: \t");
    scanf("%d", &choice);
    
    while(choice != 4) {
      
      if(choice==1) {
        printf("\nHow much do you want to deposit?\n");
        scanf("%f", &deposit);
        credit = balance + deposit;
        printf("Your current balance is %.2f \n\n", credit);
        balance = credit;
    }
    
      else if(choice==2) {
        printf("\nHow much do you want to withdraw?\n");
        scanf("%f", &withdrawal);
        debit = balance - withdrawal;
        printf("Your current balance is $%.2f \n\n", debit);
        balance = debit;
    }
    
      else if(choice==3) {
        printf("\nCurrent balance: $%.2f\n\n", balance);
    }
      
      printf("Transaction options: \n\n");
      printf("1 - Deposit funds (credit transaction) \n");
      printf("2 - Withdraw funds (debit transaction) \n");
      printf("3 - Print statement of account \n");
      printf("4 - Compute interest and exit \n\n");
      printf("Please indicate your option: \t");
      scanf("%d", &choice);
    
}
    
    system("PAUSE");
}

The value for the minimum balance would be printed under "Current balance: ..." when the user selects choice #3 (Print statement of account). I know that I will need another variable to store the minimum balance, but I'm not completely understanding the logic behind it. Can someone help me with this? I'm not necessarily asking for the code yet; I just want to understand how it is supposed to work. If I'm still lost, I would appreciate it if someone could show me the correct code. Thanks!

Originally Posted by kcpilot

As I've come to know it, a minimum balance ia an arbitray amount set by the banking institution. Basically, an amount less than the minimum balance is not worth their expenses to maintain an account of that size. Hope this helps. Maybe you have some other definition that I am not aware of --- ask the prof to clarify.

I believe the meaning here is that you keep track of the "current" balance (starts out at 2000) and as transactions occur, you keep track of the lowest that the balance has ever gotten. But yeah, at first that's what I thought.

In order to do this, you of course need to have some variable to store the minimum balance. Whatever you call it, it will start out the same as the current balance, i.e. 2000. Whenever you process a transaction, check the new current balance with the value stored in this minimum balance variable. If it is less, then you simply need to reset the minimum balance value to the current balance.

I think 3MGFX is asking about a "switch" statement.

I recently posted a method of sorting out how many days there are in a particular month - do a search for "leapyear days in month" and I'm sure you'll find that.

Sometimes banks "cheat" on the calculation front and use 12 x 30 days as a year, so each month is assumed to have 30 days equally - not sure what happens to the 5 days left over.

--
Mats