/*
 * The main program of our interest rate program and the two functions
 * it uses for writing the prompt and the headings. 
 *
 * It also uses another function to print the balances, but that
 * function is defined in another source file.
 */
#include <stdio.h>
#include <stdlib.h>

int main()
{
  void writePrompt(void);
  void printHeadings(double intrate, double balance, int period);
  void printBalances(double intrate, double balance, int period);

  int     period;                       /* length of period */
  double  balance;                      /* balance at end of year */
  double  intrate;                      /* interest rate */
  int     n;                            /* number of values read */
  
  writePrompt();
  while ((n = scanf("%lf %lf %i", &intrate, &balance, &period)) == 3)
  {
    printHeadings(intrate, balance, period);
    printBalances(intrate, balance, period);

    writePrompt();
  }

  if (n != EOF)
    printf("Warning: Encountered error in reading input.\n");

  return EXIT_SUCCESS;
}

/* Prompt the user for all necessary input values */

void writePrompt(void)
  { printf("Enter interest rate, principal, and period: "); }

/* Print the headings that will precede the interest table */

void printHeadings(double intrate, double balance, int period)
{
  printf("Interest Rate:      %7.2f%%\n", intrate * 100);
  printf("Starting Balance: $ %7.2f\n", balance);
  printf("Period:             %7i years\n\n", period);
  printf("Year     Balance\n");
}