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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 box_car_volume, for example:
double box_car_volume (double h, double w, double l) {
return h * w * l;
}
When box_car_volume is used, any existing values for other variables
that happen to be named h, w, and l are protected:
box_car_volume fence--------------* The values of h, w, and l | The value of h, w, and l inside | outside the fence, if any, | this fence are isolated from | are not affected by the | values outside | values inside | | | Function computes the value of | | h * w * l using the values of | | h, w, and l inside this fence | *---------------------------------*