MatLab Question In fluid dynamics the Reynolds number Re is

MatLab Question

In fluid dynamics, the Reynolds number Re is a dimensionless number used to determine the nature of a fluid flow. For an internal flow (e.g., water flow through a pipe), the flow can be categorized as follows: Write a script that will prompt the user for the Reynolds number of a flow and will print the region the flow is in. Then, answer the following question. Would it be a good idea to write the selection statements using switch? (Why or why not?)

Solution

main.m

clc;
close all;
clear all;
Re = input(\'enter rynolds number of flow : \')

if Re<=2300
disp(\'The flow is in Leminar Region\')
elseif Re>2300 && Re<=4000
    disp(\'The flow is in Transition Region\')
else
disp(\'The flow is in Turbulent Region\')
end

Output :

enter rynolds number of flow : 2000

Re = 2000

The flow is in Leminar Region

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Yes, It would be good idea to write selection statements using switch because unlike if-then and if-then-else statements, the switch statement can have a number of possible execution paths. A switch works with a scalar, a string, or a cell array of scalars or strings

A switch block conditionally executes one set of statements from several choices. Each choice is a case.

An evaluated switch_expression is a scalar or string. An evaluated case_expression is a scalar, a string, or a cell array of scalars or strings. The switch block tests each case until one of the cases is true. A case is true when:

For numbers, isequal(case_expression,switch_expression).

For strings, strcmp(case_expression,switch_expression).

For cell array case expressions, switch_expression is a member of the case_expression.

When a case is true, MATLAB executes the corresponding statements, and then exits the switch block.

otherwise is optional, and executes only when no case is true.