```
/***************************************************
Compound Interest
Write a program that reads an annual interest rate
and a term (number of years) from the user, and
computes the ammount of money you'd have after that
number of years at that interest rate, assuming you
make $100.00 payments into the account at the
beginning of each year.
The formula for interest is this: If A is the
amount of money in your account at the beginning of
the year, and r is the annual interest rate, the
amount in your account at the end of the year is:
A*(1.0 + r/100.0)
***************************************************/
#include "si204.h"
int main() {
// Read interest rate
fputs("Enter interest rate: ", stdout);
double r = readnum(stdin);
// Read number of years
fputs("Enter number of years: ", stdout);
int total_years = readnum(stdin);
// INITIALIZATION FOR THE LOOP
double T = 0.0; // We don't have any money yet
int years = 0; // no years gone by yet
// LOOP: COMPUTE total_years COMPOUNDING STEPS
while (years < total_years) {
// update T and years for one more year gone by
T = (T + 100.0) * (1.0 + r/100.0);
years = years + 1;
}
// Write out results
fputs("Final amount is: $", stdout);
writenum(T, stdout);
fputs("\n", stdout);
return 0;
}
```