C Programming: Preprocessor Directives in C -> define Macro section

All Preprocessor directives

Objective of this post: How to define Macro? single line, multiple lines? Where can we define it?

Syntax and  explaination: 
            Single line : https://www.techonthenet.com/c_language/constants/create_define.php

            Multiple lines : https://docs.microsoft.com/en-us/cpp/preprocessor/hash-define-directive-c-cpp?view=vs-2017

           
== 1. To define single and multiple lines Macro  from online source  ==

#include <stdio.h>
#define NUMNER_PER_LINE 10  // To define single line

/* Below is to define multiple lines */

#define PRINT_A_to_B(A, B) \

   { \
     int a=A, b=B, counterNumber=1; \
     printf("\nFrom=%d to %d have shown as below\n",a,b); \
     for( ; a<=b ; printf("%03d ",a) && a++ && counterNumber++) \
     { \
         if(0==counterNumber%NUMNER_PER_LINE) \
         { \
           printf("%03d\n",a); a++; counterNumber=1; \
         } \
     }; \
     printf("\n\n"); \
   };

int main(int argc, char *argv[])
{ 
    system("mode con: cols=150 lines=50"); /* To  set  size of console output */
    printf("1.  Compiler will replace Macro to source code first then compile text or source code to binary\n");
    printf("2.  We can define Macro anywhere including in function\n");
    printf("3.  Actually, we define Macro in one line. If it is too long you can type to the next line with \\ as above sample\n\n\n");
   
     PRINT_A_to_B(1, 23);
     PRINT_A_to_B(12, 35);
  
   return 0;
}

Above sample for define single and multiple Macro 

== 2. My experience about to define Macro everywhere ==

#include <stdio.h> int iPrintMaxNumber(int a, int b)
{
     #define MAX_NUMBER(x,y) (x > y ? x : y) /* define Macro in function */
     return MAX_NUMBER(a,b);
}

#define MIN_NUMBER(c,d) (c < d ? c : d) /* define Macro anywhere but NOT below main() */
int main(int argc, char *argv[])
{
     system("mode con: cols=150 lines=50"); /* To set size of console output */
     printf("This sample to show you how to define Macro in function\n");
     printf("Max number between 10 and 23 = %d\n",iPrintMaxNumber(10, 23));
     printf("Max number between 23 and 23 = %d\n",iPrintMaxNumber(23, 23));
     printf("Max number between -5 and -100 = %d\n",iPrintMaxNumber(-5, -100));

     printf("\n\n\nThis sample to show you how to define Macro anywhere but before main() function\n");
     printf("MIN number between 10 and 23 = %d\n",MIN_NUMBER(10, 23));
     printf("MIN number between 23 and 23 = %d\n",MIN_NUMBER(23, 23));
     printf("MIN number between -5 and -100 = %d\n",MIN_NUMBER(-5, -100));

    return 0;
}

REMARK: Please take a look at comment. It tells you clearly.

This one shows how to define Macro everywhere

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