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//include headers; these are modules that include functions that you may use in your

 //program; we will almost always need to include the header that

// defines cin and cout; the header is called iostream.h

#include <iostream.h>

int main() {

//variable declaration

//read values input from user

//computation  and print output to user

return 0;


After you write a C++ program you compile it; that is, you run a program called compiler that checks whether the program follows the C++ syntax

if it finds errors, it lists them

If there are no errors, it translates the C++ program into a program in machine  language which you can execute

what follows after // on the same line is considered comment

indentation is for the convenience of the reader; compiler ignores all spaces and new line ; the delimiter for the compiler is the semicolon

all statements ended by semicolon

Lower vs. upper case matters!!

Void is different than void

Main is different that main

The infamous
Hello world program

When learning a new language, the first program people usually write is one that salutes the world :)
Here is the Hello world program in C++.
#include <iostream.h>
int main() {
cout << “Hello world!”;
return 0;
Variable declaration

type variable-name;
Meaning: variable <variable-name> will be a variable of type <type>
Where type can be:
int //integer
double //real number
char //character
int a, b, c;
double x;
int sum;
char my-character;