Circle program, basic GradeBook class
Tuesday, January 26, 2016
9:16 AM
Homework exercise 2.20:
Write a program that reads in the radius of a circle as an integer and prints out the circle's diameter,
circumference, and area.
/**************************************************
/* Given an integer radius, print out the area
/* diameter, circumference of a circle.
/**************************************************/
#include <iostream>
// required for using cin and cout
using namespace std;
// make our lives easier by avoiding the need
// to write std:: all the time.
int main()
{
int
radius
= 0; // the features of our circle (radius is input
// by the user)
float circ
= (float) 0.0;
float diameter = (float) 0.0;
/**************************************************
float area
= (float) 0.0;
/* Given an integer radius, print out the area
/* diameter, circumference of a circle.
cout << "Enter the circle radius as an integer: ";
/**************************************************/
cin >> radius;
circ
= (float) (3.1415926 * 2.0 * radius);
diameter = (float) (2.0 * radius);
area
= (float) (3.14159265 * radius * radius);
cout << "Circumference is: " << circ << endl;
cout << "Diameter is:
" << diameter << endl;
cout << "Area is:
" << area << endl;
#include <iostream>
// required for using cin and cout
using namespace std;
// make our lives easier by avoiding the need
// to write std:: all the time.
int main()
{
int
radius
return -1;
}
= 0; // the features of our circle (radius is input
// by the user)
cout << "Enter the circle radius as an integer: ";
cin >> radius;
cout << "Circumference is: " << (3.1415926 * 2.0 * radius) << endl;
cout << "Diameter is:
" << (2.0 * radius) << endl;
cout << "Area is:
" << (3.14159265 * radius * radius) << endl;
}
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