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Basic Structure of C++ Programming



Basic Structure of C++ Programming

#include<iostream>Using namspace std;int main(){

Program code will be written here

return 0;}



#include<iostream>

## is called preprocessor directive

PreprocessingPreprocessing is the phase of compilation before the actual execution.



#include<iostream>

These are the header files inclusion statement

Header FilesHeader files are the predefined files in the C++ library using which we create new program.



int main()

This is the main() method/function of a C++ program. Actual execution of a program starts from method.



First C++ Program#include<iostream>Using namespace std;Int main(){Cout<<“My First C++ Program\n”;Int x = 10;Cout<<“x = “<<x<<endl;Cout<<“x = “;Cin>>x;Cout<<“x = “<<x<<endl;Return 0 ;}



iostream

Iostream stands for Input Output Stream

It contains functions related to input and output.

For ex:- cout,cin etc.



Cout<<“ text to be display”;

Define Within iostream

The text written within double quotes(“ “) will got

displayed on the output screen as it is.



Cin>>variable_name;

Define Within iostream

It takes input values from the user



Rules of C++ Language

Every program should have main()

Every statement should be end with semicolon(;)

This Language is case sensitive

All the letter should be in lowercase.



Escape sequences

\n – New Line \0 – Null

\t – Horizontal tab

// - \

/’ – ‘

/” – “



Comments in a C++ Program

Comments are used to increase understandability and

readability of program. These comments will be

ignored by the compiler at the time of

compilation/execution.

i.e. comments are part of a program but not the part

of compiled/executed code.



Type of comments

Single Line Comments Starts with // and treats all the contents

following // as comments within that line

Multiple Line Comments Starts with /* and end with */ and all the contents

in between will be treated as comments



Comments Usage Example/* Title:- My First C++ ProgramCreated By:- XYZ#include<iostream>#include<conio.h>Int main(){Clrscr(); // to clear the output screenCout<<“My First C++ Program”;Getch();Return 0 ; //to pause the final output}



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