Thread: Can't stop my program at zero (Loan Table)

You never subtract the payment from the loan. Therefore the outstanding loan grows forever.

EDIT:

Here's working code:

Code:

#include <stdio.h>

int main()

{
    double loan_amt;
    double interest_rate;
    double remaining;
    double interest;
    double payment;
    int month = 1;
   
    printf("Enter the loan amount\n");
    scanf("%lf", &loan_amt);
    printf("Enter the monthly interest rate of the loan\n");
    scanf("%lf", &interest_rate);
    printf("Enter the amount of the monthly payment\n");
    scanf("%lf", &payment);
   
    printf("+-------+---------+-----------+----------+\n");    
    printf("| Month | Payment | Interest  | Remaining | \n");
    printf("+-------+---------+-----------+----------+\n");
   
    interest_rate = (loan_amt*(interest_rate/100));
   
while(loan_amt > 0)
    { 
      interest = (loan_amt*(interest_rate/100)); 
      /* EDIT START EDIT START EDIT START */
      /* notice the "-payment" at the end, that's the only part i added */
      loan_amt = loan_amt+interest-payment;
      /* EDIT END EDIT END EDIT END */ 

      printf("| %3d   | %5.2lf  | %4.2lf     | %.2lf   |\n",
      month, payment, interest, loan_amt);
      month++;
            if(payment > (loan_amt + interest)) 
      {
        interest = (loan_amt*(interest_rate/100));   
        payment = (loan_amt + interest);   
        loan_amt = 0; 
        printf("| %3d   | %5.2lf  | %4.2lf     | %.2lf   |\n",
        month, payment, interest, loan_amt);
    
      }
    }

    system("PAUSE");
    return 0;
}

EDIT #2:

You also need to add code to check if the interest is greater than the payment. If that is the case the loop just goes on forever...

Edit* trying to figure it out

Code:

      if(interest > payment)
      {
        printf("\nO noes! Your interest is greater than your payment and the \n"
               "loop goes on forever!\n\n");
        system("PAUSE");
        return 0;
      }

Originally Posted by ITAmember

Code:

      if(interest > payment)
      {
        printf("\nO noes! Your interest is greater than your payment and the \n"
               "loop goes on forever!\n\n");
        system("PAUSE");
        return 0;
      }

I think

Code:

if(interest > payment)
  {
      while (1) {
        printf("\nO noes! Your interest is greater than your payment and the \n"
                  "loop goes on forever!\n\n");
      }
  }

would be more fitting

Instead of entering 1.2 for the interest rate you enter 0.012. 1.2 would be 120%, 0.012 would be 1.2%.

Code:

Enter the loan amount
5500
Enter the monthly interest rate of the loan
0.012
Enter the amount of the monthly payment
700
+-------+---------+-----------+----------+
| Month | Payment | Interest  | Remaining |
+-------+---------+-----------+----------+
|   1   | 700.00  | 36.30     | 4836.30   |
|   2   | 700.00  | 31.92     | 4168.22   |
|   3   | 700.00  | 27.51     | 3495.73   |
|   4   | 700.00  | 23.07     | 2818.80   |
|   5   | 700.00  | 18.60     | 2137.41   |
|   6   | 700.00  | 14.11     | 1451.51   |
|   7   | 700.00  | 9.58     | 761.09   |
|   8   | 700.00  | 5.02     | 66.12   |
|   9   | 66.55  | 0.44     | 0.00   |
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