I am learning C++, and I am confused about the double command. I hope you could explain to me when and where I should use this one. mathematical statement.3 #include 4 #include 5 using namespace std;67 //Function prototypes8 double getRadius();9 double square(double number);1011 int main()12 {13const double PI = 3.14159;// Con-stant for pi14double radius;// Holdsthe circle's radius15double area;// Holds

Answered: I am learning C++, and I am confused…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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I am learning C++, and I am confused about the double command. I hope you could explain to me when and where I should use this one.

mathematical statement.
3 #include <iostream>
4 #include <iomanip>
5 using namespace std;
6
7 //Function prototypes
8 double getRadius();
9 double square(double number);
10
11 int main()
12 {
13
const double PI = 3.14159;
// Con-
stant for pi
14
double radius;
// Holds
the circle's radius
15
double area;
// Holds

Expert Solution

Step 1

lets understand double keyword:
when you have to store a value which has decimal point value(for example:3.14,2.5,1.2,,,) in a variable, you have to declare it as double, since double keywords denotes the value in the variable is floating point
so, double keyword is used, when we have to store floating point values

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