how to define more in c++?

[slaidas]

you can define one variable for ex. #define shoutx cout. But if you write for ex. #define kint int. Or #define LNUMBER CALLBACK. Compiler show error. How to define statement, or block of statements to one word. For ex. When you write whilex; compiler reads it as while (a > 10) {
cout << a; a++;}.

[hamsterman]

#define PROGRAM int main(){ return 0; }

PROGRAM

is perfectly valid. You must keep the whole #define statement in one line. If you end a line with "\", compiler still sees that as one line.

[shacktar]

I assume you wanted it to be while (a < 10). Otherwise, your loop would be infinite for unsigned ints and would go for a long time for ints.

#define WHILEX(Var,Num) while(Var < Num){cout << Var; Var++;}

or as mulitple lines

#define WHILEX(Var,Num) while(Var < Num)\
{\
     cout << Var;\
     Var++;\
} 

Example:

#include <iostream>
using namespace std;

#define WHILEX(Var,Num) while(Var < Num){cout << Var; Var++;}

int main()
{
     int a = 0;
     WHILEX(a,10);
}

[anonymous23323124]

Usually it is neater and safer to use an inline function for this purpose:

inline void WhileX()
{
   while (a < 10) {
      cout << a;
      a++;
   }
}

Coincidentally, this construct is what a 'for' loop is for:

for (unsigned a=0; a<10; a++)
{
   cout << a;
}

is the same as

unsigned a=0;
while (a < 10) { 
   cout << a;
   a++;
}

-Xander

[slaidas]

thx a lot I will try these codes!

[LB]

_{shacktar wrote:}

your loop would be infinite for unsigned ints and would go for a long time for ints.

Are you saying that unsigned types don't wrap around the same way signed types do? All primitive integer data types, signed or not, wrap around (overflow).

[slaidas]

why compiler wont define this line? [code] #define declarex LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM) [/CODE]

[slaidas]

code was in one line.

[anonymous23323124]

What compiler error are you getting?

[shacktar]

Are you saying that unsigned types don't wrap around the same way signed types do?

Oops, nevermind, brain fart there.

[HenriK]

I´m not going to give any tips, tricks or hints here, but I´d suggest someone to create an article about this preprocessor feature. There might be some people (including me) that are not aware of this feature.

[Zhuge]

You mean something like this?
http://cplusplus.com/doc/tutorial/preprocessor/

[HenriK]

Sheesh, yes. No I feel myself like an idiot.