“##” OPERATOR IN C

## is a pre-processor macro in C.

 It is used to concatenate 2 tokens into one token.

 

Example program:

#include<stdio.h>

#define concatination(a,b) a ## b

int main ()

{

   int ab = 1000;

   printf("The concatenated value is:%d \n",concatination(a,b));

   return 0;

}

Output:

 The concatenated value is: 1000