1. Screen output // Definition and use of variables
#include <iostream>
using namespace std;
int gVar1; // Global variables,
int gVar2 = 2; // explicit initialization
int main() {
char ch('A'); // Local variable being initialized
// or: char ch = 'A';
cout << "Value of gVar1: " << gVar1 << endl;
cout << "Value of gVar2: " << gVar2 << endl;
cout << "Character in ch: " << ch << endl;
int sum, number = 3; // Local variables with
// and without initialization
sum = number + 5;
cout << "Value of sum: " << sum << endl;
return 0; }
Screen output
Value of gVar1: 0
Value of gVar2: 2
Character in ch: A
Value of sum:

2. // Circumference and area of a circle with radius 2.5
#include <iostream>
using namespace std;
const double pi = ;
int main() {
double area, circuit, radius = 1.5;
area = pi * radius * radius;
circuit = 2 * pi * radius;
cout << "\nTo Evaluate a Circle\n" << endl;
cout << "Radius: " << radius << endl
<< "Circumference: " << circuit << endl
<< "Area: " << area << endl;
return 0; }
Screen output
To Evaluate a Circle
Radius: 1.5
Circumference:
Area:

15. The C++ Compilation Model & IDE

16. Everything is Done Using an IDE
Using Integrated Editor
Everything is Done Using an IDE

17. Fill-in-the-Blank Questions
1. Compilers detect ________ errors.
2. Usually the most difficult errors to correct are the
________ errors, since they are not detected in the
compilation process.
3. Attaching other pre-written routines to your
program is done by the _________ process.
4. _______code is the machine code consisting of ones and zeroes that is read by the computer.
5. Dividing by zero is an example of a _________ error.