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Because parameters are just variables that happen to be initialized by
argument values, you can change the value of any parameter using an
assignment statement. For example, you could amend the
doubling_time function as follows:
double doubling_time (double r) {
/* At this point, r's value is the rate expressed as a percentage */
r = r / 100.0;
/* Now r's value is the rate expressed as a fraction */
r = log (2.0) / log (1.0 + r);
/* Now r's value is the result of the doubling-time computation */
return r;
}
However, using r to hold three different values is bad programming
practice, because such use associates r with multiple
meanings.