Can we define Array and Macros

Help · Jul 7, 2006

Hi,

Q1) Can we define Array? How to define array?
Q2) How the Macros work in C? Do you got any sample?

eg.

Code:

#define MYCASE(_item,_id) \
   case _id: \
     _item##_##_id=_id;\
   break 

  switch(x) {
      MYCASE(widget,23);
  }

How can we make more selection for our #define MYCASE?
Is it posible we add another MYCASE(widget,24);

Thank You.

Root · Jul 7, 2006

Q1) Can we define Array? How to define array?

Code:

int X[10]; // array of 10 integer numbers
double array_of_doubles[100];
small int two[10][10]; // array 10*10 elements of "small int" type

Q2) How the Macros work in C? Do you got any sample?

a) when you use macros name, C-precompiler pastes in this place macros content. You can use in macros some specific operators (such as ## - concatenate two strings)
b) simple macros

Code:

#define MAX_NUM 10
int array[MAX_NUM];

so we get array with 10 elements...

Code:

#define MYCASE(_item,_id) \ 
   case _id: \ 
     _item##_##_id=_id;\ 
   break 

  switch(x) { 
      MYCASE(widget,23); 
  }

it is equal to this code without macros:

Code:

switch(x)
{
   case 23: widget_23=23; break;
}

Is it posible we add another MYCASE(widget,24);

it is possible...

Help · Jul 7, 2006

Hi,

Q1) Can we define the array as..

Code:

#define A array[2]={3,5}

If can how the thing work? How the A can know the array elements 3 or 5?

Thank You

osmansafa · Jul 7, 2006

q1- A can not know 3 and 5 we define it but you may leave a blank instead of writing 2 cuz the array contains 2 elements

Can we define Array and Macros

Help

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Root

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osmansafa

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