C + + Enumeration variables are applied to the switch statement __c++

The discriminant of a switch statement in C + + must be an expression that results in an integer value, and each label must be an integer constant expression (int or char).

Most of the time, we need to handle a non-integer constant expression, which can be done indirectly using an enumeration variable.

The sample program is as follows:

#include <iostream>
enum {red, orange, yellow, green};

int main ()
{
  using namespace std;
  int code;
  CIN >> Code;
  While (Code >= red && Code <= Green)
  {
    switch (code)
    {case
      red      : cout << "Red"; break;
      Case Orange   : cout << "Orange";
      Case Yellow   : cout << "Yellow";
      Case Green    : cout << "green";
    CIN >> Code;
  cout << "bye!" <<endl;
  return 0;
}