Basic C programming question

[arm_learner]

Basic C Programming

#define Z 1
#if Z
A
#else
B
#endif
********************
I want to know Z will select A or B?
Thz!

 

[checkmate]

Re: Basic C Programming

A will be chosen.

0 will be mapped to FALSE.
Anything else will be mapped to TRUE.

 

[raj_rohit10]

Re: Basic C Programming

it will certainly select A

 

[muko]

Basic C Programming

certainnly A is chosen!

 

[I AND MY SCIENCE]

Re: Basic C Programming

WE CERTAINLY GET A BECAUSE WE HAVE DEFINED Z=1 .

 

[s2c97]

Basic C Programming

It will definitely be A.

You defined Z=1

if Z=1 -> A
else if Z= 0 -> B

s2c97

 

[DigitalScholar]

Re: Basic C Programming

As everybody else stated, It will select A. The reason being simple that the preprocessor will simply replace 'Z' with '1' wherever it encounters Z. So the preprocessor output will be like

#if 1
A
#else
B
#endif

which obviously results in A.

DigitalScholar

 

[swgchlry]

Basic C Programming

which obviously results in A

 

[nj_jack]

Basic C Programming

This is a very simple question.
A will be chosed.

 

[boeysue]

Re: Basic C Programming

This will help some one to develope code during degugging. And than deleting
the code of the 0 part.

 

[timber23]

Re: Basic C Programming

#define Z 1
#if Z
A
#else
B
#endif
********************
I want to know Z will select A or B?
Thz!

There's another way to do this which I personally prefer.

#define DEBUG // use #undef DEBUG if not in debug mode
#if defined (DEBUG)
A
#elseif
B
#endif

or

#undef DEBUG
#if !defined (DEBUG)
B
#elseif
A
#endif