#define

[OOzy]

Hi

what does this mean

#define ToRad(X) X*(PI/180)

does it mean like
int ToRad(X)
{
return X*(PI/180)
}

 

[ankan]

It just means

replace 'ToRad(X)' with 'X*(PI/180)' wherever you find it in the file except when it is within quotes (" &quot or when it is within a comment (/* */ or //).

Its directed to the preprocessor, and occurs before the compilation actually begins. Ankan.

Please do correct me if I am wrong. s-)

 

[vkarthik]

It works similar to what u've written but all occurances of the macro are replaced even before compilation. for ex.
if u use ToRad(5) somewhere in ur program that gets replaced by 5*(PI/180). this type of macro function is not allocated any memory as it doesn't exist during compilation.

 

[Cagliostro]

I think you should do:
#define ToRad(X) ((X)*(PI/180))
/*see ()*/ Ion Filipski

filipski@excite.com

 

[Zyrenthian]

I agree with John, the extra parens will help you to avoid any Macro errors which are a PAIN to debug.

Matt

 

[vkarthik]

thats right, take the case
#define a(x) x*x

when u use 100/a(10), that becomes 100/10*10 & u get 100. so watch the ().

 

[Jcan]

What Ankon said is right.