#include
/* Supplemental Problem 2 Sample Code
this program performs a computation and prints the results,
based on data in arrays
*/
/* function computes results based on value and n */
/* pre-conditions: value is a double
n is an int
post-conditions: double is returned
*/
double compute_neg_power (double value, int n);
/* function computes results based on 3 parameters */
/* pre-conditions: ann rate and amt are doubles
years is an int
post-conditions: double is returned
*/
double compute_payment (double annRate, int years, double amt);
/* three parameters are used to compute a result */
/* pre-conditions: ann Rate is a double
years is an int
amt is a double
post-conditions: double is returned
*/
double total_paid(double annRate, int years, double amt);
/* the main procedure starts here */
int main ()
{
int numCases = 4; /* declared int variable numCases is set to 4 */
/* double array is declared and initialized */
double annualRate[] = { 8.75, 5.35, 5.35, 4.35 };
int years [] = { 25 , 30 , 30 , 35 };
/* double array is declared and initialized */
double amount [] = {26000.0, 90000.00, 90000.00, 90000.00};
/* printf writes "Mortgate Payment Table" as a line of output */
printf ("Mortgage Payment Table\n");
/* printf statement writes another line of output */
printf ("annual rate years amount monthly payment total paid\n");
int i; /* i declared as an int */
/* for loop with i starting at 0
continuing until i < numCases
incrementing i by 1 after each iteration */
for (i = 0; i < numCases; i++)
{
/* payment declared as a double and given the value of a function */
double payment = compute_payment (annualRate[i], years[i], amount[i]);
/* total declared as a function and given result after function call */
double total = total_paid (annualRate[i], years[i], amount[i]);
/* printf of 1 double, followed by an int, followed by 3 doubles */
printf ("%8.2lf %7d %12.2lf% 11.2lf %16.2lf\n",
annualRate[i], years[i], amount[i], payment, total);
}
/* return the value 0 */
return 0;
}
/* function computes results based on value and n */
/* pre-conditions: value is a double
n is an int
post-conditions: double is returned
*/
double compute_neg_power (double value, int n)
{
/* comments on the right used here for variety */
double result = 1.0; /* double initialized to 1.0 */
int i; /* i declared as an int */
for (i = 1; i <= n; i++) /* for loop starts at 1, tests i <= n,
and increments by 1 each iteration */
result *= value; /* result multiplied by value */
return 1.0 / result; /* return 1.0 divided by result */
}
/* function computes results based on 3 parameters */
/* pre-conditions: ann rate and amt are doubles
years is an int
post-conditions: double is returned
*/
double compute_payment (double annRate, int years, double amt)
{
/* variable monthlyRate declared as a double and initialized */
double monthlyRate = annRate / 1200.0;
/* computation involving addition, subtraction, multiplication,
and division made. computation also involves a function call
result is returned */
return amt * monthlyRate /
(1.0 - compute_neg_power((1 + monthlyRate), (12*years)));
}
/* three parameters are used to compute a result */
/* pre-conditions: ann Rate is a double
years is an int
amt is a double
post-conditions: double is returned
*/
double total_paid(double annRate, int years, double amt)
{
/* variable PaymentInCents initialized after function call and computations */
int paymentInCents =
(int) (compute_payment (annRate, years, amt) * 100.0 + 0.5);
/* value returned is 12 times years times paymentInCents divided by 100.0 */
return 12 * years * paymentInCents / 100.0;
}