4 Assignment Operators The assignment operator is used to assign a value to a

4 assignment operators the assignment operator is

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// This program calculates the area of a circle. // The formula for the area of a circle is PI times // The radius squared. PI is 3.14159. #include <iostream> #include <math.h> // needed for pow function (See Book Page 127 for more information) using namespace std; int main() { const double PI = 3.14159; double area, radius; cout << "This program calculates the area of a circle.\n"; cout << "What is the radius of the circle? "; cin >> radius; area = PI * pow(radius, 2.0); cout << "The area is " << area << endl; return 0; } Output: This program calculates the area of a circle. What is the radius of the circle? 2 The area is 12.56 FORMATTING OUTPUT: The same data can be printed or displayed in several different ways. For example, all of the following numbers have the same value, although they look different: 720 720.0 720.00000000 7.2e+2 +720.0 The way a value is printed is called its formatting. The cout object has a standard way of formatting variables of each data type. Sometimes, however, you need more control over the way data is displayed. For formatting manipulator functions we use <iomanip> header file in C++ program. There are different type of manipulator functions: 1) setw 2) setprecision 3) fixed 4) showpoint 5) left and right 6) setfill
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Reference: Book Page 120 Example: #include <iostream> #include <iomanip> using namespace std; void main( ) { double no=100.56; cout<<setw(10)<<setfill('*')<<"R"<<endl; cout<<fixed<<setprecision(8)<<no <<endl; system("pause"); } Output: *********R 100.56000000 Lab Tasks: Task 1 With the help of manipulator functions write the program that produces the following output < Solution and output of Task 1 > Task 2
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