Find the object that has global scope in the calculator example and modify the program in such a way that it does not have anymore objects with global scope.
This is the Drill 2 from page 298 of the textbook.
Write three functions swap_v(int,int)
, swap_r(int&,int&)
, and
swap_cr(const int&, const int&)
. Each should have the body { int
temp; temp = a, a=b; b=temp; }
where a
and b
are the names of the arguments.
Try calling each swap like this
int x = 7;
int y =9;
swap_?(x,y); // replace ? by v, r, or cr
swap_?(7,9);
const int cx = 7;
const int cy = 9;
swap_?(cx,cy);
swap_?(7.7,9.9);
double dx = 7.7;
double dy = 9.9;
swap_?(dx,dy);
swap_?(7.7,9.9);
Which functions and calls compiled, and why? After each swap that compiled, print the value of the arguments after the call to see if they were actually swapped.