Thread: Question about enum.

Originally Posted by mewatC

Hello,

i did not have used enum so far, so i have the following questions:

Code:

enum Numbers { ONE, TWO, THREE, FOUR, FIVE };
typedef enum { ONE, TWO, THREE, FOUR, FIVE } Numbers;

1. What is the difference?

2. I have the words ONE, TWO..., why do i need the word Numbers?

3. How i have to use Numbers, i tried some ways but nothing worked?

Thank you!

greetings
newatC

1. usage to declare the new var
enum Numbers myvar;
or just
Numbers myvar;
2.to be possible to declare var of this type, so the compiler can check the incorrect type handling
For example one function awaits as a parameter var of type Numbers, and another one Colors. If you store both Numbers and Colors in the int var - compiler cannot check for you, if the by mistake pass the color insted of the number.
But if you declare to different enums and use them for declaring functions parameters - compiler can find the typing mistakes for you. So give the compiler to make as much work as he can in checking your code.
3.

Code:

Numbers choice;
"Enter number:"
read string
if(strcmp(string,"One")==0) choice = ONE;
else if(strcmp(string,"Two")==0) choice = TWO;
...

some other places
switch (choice)
{
case ONE:...
case TWO: ...
...
}

You don't need to stroe strings - only small var
You can use switch on it
You can make printing strings depending on choice language dependend (input can be in english, but output in any other language) etc