C++ Preprocessor Operators

What are C++ Preprocessor Operators?

Following preprocessor operators are available in C++ that could be used with the #define directive.

• # is stringify operator turns the operand into a string. Can be used only in macro replacement text. Macro parameter name must follow this operator.

• ## is concatentation operator to cat preprocessor tokens. Can be used only in macro replacement text. Must not appear in the beginning or end of replacement text.
  
  

EXAMPLE: Demonstrate the usage of preprocessor operators

#include <iostream>
using namespace std;

#define myprint1(a)    cout << #a << endl
#define myprint2(a,b)  cout << a##b << endl

int main()
{
  myprint1(hello);
  myprint2("hello","world");
  return 0;
}

OUTPUT:-
hello
helloworld

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