Overview

A simple C++ program may have the following form:

#include <iostream>
#include "myheader.h"
using namespace std;

const int   c1 = ...;  // c1, c2 are the names of
const float c2 = ...;  //                  constants
struct      s1 {...};  // s1, s2 are the names of
struct      s2 {...};  //                  user-defined structures
class       x1 {...};  // x1, x2 are the names of
class       x2 {...};  //                  user-defined classes

int main()
{
   int      v1, v2;    // v1, v2 are variables of predefined type int
   s2       v3;        // v3 is a variable of user-defined type s2

   cin >> v1;          // program body is a sequence of
   ......;             // statements separated by semicolons
   ......;
   v2 = v1 + c1;
   ......;
   cout << v1 << " becomes " << v2 << endl;

   return 0;           // main program always returns 0 if successful
}