|
|
|
|
|
|
|
It is important to know that the parameter values established when a
function is entered are available only inside the function. It is as
though C builds a isolating fence to protect any other uses of the same parameter name outside
of the function. Consider doubling_time, for example:
double doubling_time (double r) {
return log (2.0) / log (1.0 + r / 100.0);
}
When doubling_time is used, any existing values for other variables
that happen to be named r are protected:
doubling_time fence ---------------* | The value of r inside this fence | The values of r | is isolated from values outside | outside the fence, | | if any, are not | Function computes the doubling | affected by the value | time using the value of r | inside | inside this fence | *----------------------------------*