Indeed. The 2nd edition of the book is based on a previous version C++ and is non-standard. Many of the code examples will not compile, and many of the exercises and questions have typos.
If you're serious about learning C++, you should pick up the 5th edition of the book.
Cheers!
C++ Workshop - C++ Keywords, Variables, & Constants (Ch. 3)
I would like to know if this is correct. You can use the same variable name for multiple function without them being the same.
Just like you can have a command with the same name in multiples namespace doing different things, you can have multiple different variables with the same name, right ?
#include <iostream>using namespace std;int foo(){ cout<<"a in foo" <<endl; int a=5; cout<<a <<endl; return 0;}int main(){ cout<<"a in main" << endl; int a=8; cout<<a <<endl; test(); cout<<a <<endl; // Proves that "a" in main is different from "a" in foo. return 0;}Just like you can have a command with the same name in multiples namespace doing different things, you can have multiple different variables with the same name, right ?
Quote:Original post by Myotis
I would like to know if this is correct. You can use the same variable name for multiple function without them being the same.
Yes.
Quote:Original post by Myotis
Just like you can have a command with the same name in multiples namespace doing different things, you can have multiple different variables with the same name, right ?
If you mean "the same name but in different namespaces" then yes.
<ADVANCED>
In fact, this is more complex than this, but you'll learn more about abou this subject in a later chapter. As for today, your approximation is good enough.
</ADVANCED>
Regards,
About the enum command :
The section about it in the book is pretty short. The exemple it shows uses the enum in the code to test condition...What about using enum with cout<< and cin>> ?
If you output a color such as :
the output will be 1. Is there a way to make it be "red" ?
Also, I dont see how you can input an enum.
This code wont compile. I thought the user would have to enter either a number from 0 to 6 or simply the color names. How do you input a color ?
Thanks a lot.
The section about it in the book is pretty short. The exemple it shows uses the enum in the code to test condition...What about using enum with cout<< and cin>> ?
If you output a color such as :
#include <iostream>using namespace std;int main(){ enum COLOR{blue, red, yellow, green, black, pink}; COLOR mine=red; cout<<mine; cout<<endl; return 0;}the output will be 1. Is there a way to make it be "red" ?
Also, I dont see how you can input an enum.
#include <iostream>using namespace std;int main(){ enum COLOR{blue, red, yellow, green, black, pink}; COLOR mine; cin>>mine; cout<<mine; cout<<endl; return 0;}This code wont compile. I thought the user would have to enter either a number from 0 to 6 or simply the color names. How do you input a color ?
Thanks a lot.
Quote:Original post by Myotis
About the enum command :
The section about it in the book is pretty short. The exemple it shows uses the enum in the code to test condition...What about using enum with cout<< and cin>> ?
If you output a color such as : *** Source Snippet Removed ***
the output will be 1. Is there a way to make it be "red" ?
Also, I dont see how you can input an enum.
*** Source Snippet Removed ***
This code wont compile. I thought the user would have to enter either a number from 0 to 6 or simply the color names. How do you input a color ?
Thanks a lot.
enums just give you an easy way to "enumerate" settings. they are an easier way of writing:
const int blue = 0;const int red = 1;etc...The names cannot be output, as it will only output the value, the same way you can't cout a variable name. The easiest way to output an enum value would be:
enum Color {BLUE, RED, YELLOW};Color c = RED;if (c == BLUE) cout << "blue";else if (c == RED) cout << "red";else cout << "yellow";
Hi guys,
Ive just finished the Quiz Questions from JWalsh and was wondering where I could find the answers to see whether I answered them correctly?
Thank you.
Edit: Sorry guys, found the thread.
Ive just finished the Quiz Questions from JWalsh and was wondering where I could find the answers to see whether I answered them correctly?
Thank you.
Edit: Sorry guys, found the thread.
I got through it fairly easy. What I've noticed, Most of this stuff in the first few chapters I seem to really already know for the most part (Just not how to do it in C++.) having been a beginner programmer of DarkBASIC previously.
Anyways, Thanks again JWalsh
Have fun everyone!
Marcus
Anyways, Thanks again JWalsh
Have fun everyone!
Marcus
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