Print Hello World without semicolon in C/C++

Every statement in C++ must end with a semicolon as per basics. However, unlike other languages, almost all statements in C++ can be treated as expressions. However there are few scenarios when we can write a running program without semicolon. If we place the statement inside an if/switch/while/macro statement with a blank pair of parentheses, we don’t have to end it with a semicolon. Also, calling a function that returns void will not work here as void functions are not expressions. We can although use a comma operator, with any value in the right hand side of the operator. Examples:

1. Using if statement: CPP

   // CPP program to print
   // Hello World without semicolon
   // using if statement
   #include <iostream>
   int main()
   {
       if (std::cout << "Hello World ") 
       {
       }
   }
   

   Output:

   Hello World

2. Using switch statement: CPP

   // CPP program to print
   // Hello World without semicolon
   // using switch statement
   #include <stdio.h>
   int main()
   {
       switch (printf("Hello World ")) 
       {
      
       }
   }
   

   Output:

   Hello World 

3. Using macros CPP

   // CPP program to print
   // Hello World without semicolon
   // using macros
   #include <stdio.h>
   #define GEEK printf("Hello World")
   int main()
   {
       if (GEEK)
       {
       }
   }
   

   Output:

   Hello World 

4. Using loops (while and for) : Here, important thing to note is using !(not operator) in while loop to avoid infinite loop. CPP

   // CPP program to print 
   // Hello World without semicolon
   // using if statement
   #include<iostream>
   int main()
   {
       while (!(std::cout << "Hello World"))
       { }
       
       // for loop can also be used
       // where testing condition has cout statement
       // for (;!(std::cout << "Hello World");)
       // { }
   }
   

Hello World 

Related Article: How to print a semicolon(;) without using semicolon in C/C++?