Variable function arguments
As we saw in Chapter 2, Understanding Program Structure, function parameters in C are call by value. In other words, when a function is defined to take parameters, the values that the function body receives through them are copies of the values given at the function call. The following code copies the values of two values into function parameters so that the function can use those values in its function body:
double RectPerimeter( double h , double w ) {
h += 10.0;
w += 10.0;
return 2*(w + h) ;
}
int main( void ) {
double height = 15.0;
double width = 22.5;
double perimeter = RectPerimeter( height , width );
}
In this simple example, the RectPerimeter() function takes two parameters – h and w – and returns a value that is based on both of them –...
