Trigraphs in C++ with Examples

In C++, a trigraph is a three-character sequence that represents a single character. It means that trigraph sequences are the set of three characters starting from double question marks (??). These characters are constructed using a sequence of 3 characters called trigraphs and these set of the characters are replaces by a single character.

S.No.	Trigraph	Equivalent
1.	??=	#
2.	??/	\
3.	??’	^
4.	??(	[
5.	??)	]
6.	??!	|
7.	??<	{
8.	??>	}
9.	??-	~

Syntax:

??=define
Becomes,
#define

Below is the basic implementation example of the Trigraphs sequences:

C++

// C++ implementation to
// illustrate the example
// of trigraph sequences

# include <iostream>
using namespace std;

??=define MSG "GeeksforGeeks"
??=define Program "C++"

// Driver Code
int main()
??< // Here ??< denotes {
    cout << "My message to " << MSG << endl;
    cout << "My program is " << Program;

    return 0;
??> // Here ??> denotes }

Output:

My message to GeeksforGeeks
My program is C++

Below is another example of the Trigraph sequences:

C++

// C++ program to demonstrate
// the example
// of trigraph sequences

# include <iostream>
using namespace std;

// Here ??= denotes #
??=define Name "Kalpana"
??=define Age "23"
??=define Qualification "B.tech"
??=define From "Delhi"

// Driver Code
int main()
??<
    cout << "My Name is: " << Name << endl;
    cout << "My Age is: " << Age << endl;


    cout << "My Qualification is: "
         << Qualification << endl;
    cout << "I'm From " << From;

    return 0;
??>

Output:

My Name is: Kalpana
My Age is: 23
My Qualification is: B.tech
I'm From Delhi