Question 3 Write a function function named:posnum that prompts the user to enter

Question

Question 3

Write a function function named:posnum that prompts the user to enter a positive num-

ber and loops to error-check until user enters positive number. It returns the positive

number entered by the user and print it out on the screen. It calls a subfunction in the

loop to print an error message. The subfunction has a persistent variable to count the

number of times an error has occurred. [10]

Here is the sample output of calling the function: posnum

>> enteredvalue = posnum

Enter a positive number: -5

Error # 1 : Follow instructions!

Does -5.00 look like a positive number to you?

Enter a positive number: -33

Error # 2 . Follow instructions!

Does -33.00 look like a positive number to you?

Enter a positive number: 6

enteredvalue =

6

Explanation / Answer

clc;
clear all
close all;
k=0;
x=-2;
j=0;
while(x<=0)
x =posnum;
if (x<0)
j=subfunction(k);
end
k=k+1;
  
end
display('You enter =');
x
display('Number of times you enter wrong input =');
j

function n=posnum
n=input('Enter the valid positive number=');

function m = subfunction (k)

m=k+1;

display ('Please follow the instruction');

Enter the valid positive number=-7
Please follow the instruction
Enter the valid positive number=-6
Please follow the instruction
Enter the valid positive number=-9
Please follow the instruction
Enter the valid positive number=-3
Please follow the instruction
Enter the valid positive number=7
You enter =

x =

7

Number of times you enter wrong input =

j =

4

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