How to Print Hello World !

The "Hello world ! " program is the first step towards the C++ programming and also one of the simplest program in C++.

If u want to print "Hello world" in the screen so look at this .

// Header file for input output functions 

#include<iostream>  

using namespace std;   

// main function - 

// where the execution of program begins 

int main(){

// prints hello world 

   cout<<"Hello World !"; 

    return 0; 

} 

Output:

      Hello World ! 

         Now let's understand the logic of given above program.

•  // "C++ comments to Display hello world";  This is a comment line .  this line shows that the additional information the program . A comment does not contain any programming logic.

•  #include :  In the c++ all the lines started with pounds (#) . are called directive and processed by processor which is a program invoked by the compiler . The #include directive tell the compiler include a file #include<iostream>

•  Using namespace std : This define a scope for the identifier that are used in a program for being the identifier define in the namespace scope we must include the using directive .

•  int main () :   In C++ main() return a integer type value to the operating system . Therefore , every main() in C++ should end with a return (0) statement , otherwise a warning or an error might occur . since mains() a integer type value , return type for main() specified as int .  

• { And } : This indicate the braces { it indicate the beginning of the main function and ending of the function }.

•  Return 0 :  This is also a function this statement also return a value of the function and indicting the ending of the function.

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