Introduction to C++

A normal program which help you to understand the basics of C++.

 

#include<conio.h>                                              Header files

#include<iostream.h> 

void main()

{                                                                         Function used for basic programe

  clrscr();

  int number1, number2, sum;

  cout<<"Enter the first number ";

  cin>>number1;

  cout<<"Enter the second number ";

  cin>>number2;                                                   Main program

  sum=number1+number2;

  cout<<"The sum is "<<sum;

  getch();

}

 Now the explanation of each line 

#include<conio.h>

#include<iostream.h>

here, # symbol is preprocessor directive. it indicates that the specified header file must be included is the program.
Headers files are special predefined file files in C++ . in above progam <iostream.h> is for input/output ( cin and cout as used in program) statement. And <conio.h> is for clrscr() function and getch() function.

void main()

 It is main function and in this program we have defined void main function means it will not return any value but by default return value will become integer so we can we can define main function as per requirement like char main() if we want to return value to be an character value.

clrscr();

Thish is for clear the screen .

int number1, number2, sum;

in thish we have defined three integer which hold uor three integer values.

cout<<"Enter the first number ";

cin>>number1;

cout<<"Enter the second number ";

cin>>number2;

they are  input and output operator by using them we enter value so that we can get result.

sum=number1+number2;

this line intialise sum interger with sum of number1 and number2

getch();

this function prevent the closing of output screen unmtil any key presed by the user.

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