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Print Hello World without semicolon in C/C++

  • Difficulty Level : Easy
  • Last Updated : 26 Jul, 2017
Geek Week

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 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 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 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 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++?

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