accept input from the user, compute the output via a mathematical formula,and print a result using reasonable formatting.• Prompt the user for the radius of the lake.Accept the radius from the user. You are guaranteed that this radius will be an integer. You will learnhow to accept numbers as input very soon.• Print out the area of the half-circular lake.A sample run might look like this:Enter the radius of the lake in meters: 9The area of the lake is 127.2348 m^2.Remember that the area of a circle is given by a = Trtr. For purposes of this program, you may assume thatT = 3.1416. (Hint: Make this a constant, and you only ever have to type it once...)Program successfully runso If your program doesn't run, you get zero points but a chance to resubmit it.• Program prints out the right valueo I will not penalize you for rounding errors.• Good formatting of input and output• Readable and well-formatted program codeWrite your program in IDLE 3; anything 3.7 or above should do.In this and every program, include a header comment with your name, the name of the program (in this case,lakearea.py), and a very short description of what it does and why you wrote it. Also write comments forevery "paragraph" of code, as we will shortly discuss in class.

Algorithm: Start Read radius r Initialize pi=3.1416 Calculate area=pi*r*r Print area/2 Stop

accept input from the user, compute the output via a mathematical formula, and print a result using reasonable formatting. • Prompt the user for the radius of the lake. Accept the radius from the user. You are guaranteed that this radius will be an integer. You will learn how to accept numbers as input very soon. • Print out the area of the half-circular lake. A sample run might look like this: Enter the radius of the lake in meters: 9 The area of the lake is 127.2348 m^2.

accept input from the user, compute the output via a mathematical formula, and print a result using reasonable formatting. • Prompt the user for the radius of the lake. Accept the radius from the user. You are guaranteed that this radius will be an integer. You will learn how to accept numbers as input very soon. • Print out the area of the half-circular lake. A sample run might look like this: Enter the radius of the lake in meters: 9 The area of the lake is 127.2348 m^2.

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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Concept explainers

Variables and Constant

Constants and variables are widely used in mathematical equations and expressions. They are also commonly found in the domain of programming, where each language has its own way to differentiate between a constant and a variable. Since they have all sorts of applications, knowing their differences is a good place to start.

Question

accept input from the user, compute the output via a mathematical formula,
and print a result using reasonable formatting.
• Prompt the user for the radius of the lake.
Accept the radius from the user. You are guaranteed that this radius will be an integer. You will learn
how to accept numbers as input very soon.
• Print out the area of the half-circular lake.
A sample run might look like this:
Enter the radius of the lake in meters: 9
The area of the lake is 127.2348 m^2.
Remember that the area of a circle is given by a = Tr
tr. For purposes of this program, you may assume that
T = 3.1416. (Hint: Make this a constant, and you only ever have to type it once...)
Program successfully runs
o If your program doesn't run, you get zero points but a chance to resubmit it.
• Program prints out the right value
o I will not penalize you for rounding errors.
• Good formatting of input and output
• Readable and well-formatted program code
Write your program in IDLE 3; anything 3.7 or above should do.
In this and every program, include a header comment with your name, the name of the program (in this case,
lakearea.py), and a very short description of what it does and why you wrote it. Also write comments for
every "paragraph" of code, as we will shortly discuss in class.

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