Question

use matlab

To use the digits function, enter 1 To use the average function, enter 2 To use the perfect sum function, enter3 To exit the program, enter 4 Please select a number = 6 Please re-select again: 2 please enter the first number 3 please enter the second number: 6 please enter the third number: 3 The average equals to: 4 Write a function, called digits function that is able to calculate the number of digits and the summation of the digits. The input of this function is N (entered number) and the outputs are number_digits and sum digits. (4 marks) Write a function, called print average function that is able to calculate the average of 3 numbers and pri. The inputs of this function are a, b and c. No output is required. (3 marks) e Write a function, called Perfect sum function that receives three digit number, and checks whether the number is Armstrong number or not. The in and the output is perfect number. (4 marks) put of this function is n Example of Perfect Sum number: Now after you created the three functions, you have to write a program that can call the above functions according to the user's choice. Write a menu driven that allows the user to select from the following options (4 marks) I. To use the digits function you have to enter 1 2 To use the average function you have to enter 2. To use the perfect sum function you have to enter 3. .To Exit the program you have to enter 4 Once the user select one of the above choices you have to read the value entered by the user and then to call the respective function. If the user entered a number that is not equal to 1 or 2 or 3 or 4, the program should ask the user to re-enter again. Then, you have to use "input" to enter the values of the variables (inputs of the functions). For the digits function, you have to enter only positive number. For the average function, you have to enter greater than or equal to zero values and for the perfect sum function you have to enter a three digit number For all of the functions, the program should ask the user to re-enter again if the user entered wrong numbers

Answer 1

Using Matlab

Main Function : -

clc;
clear all;
flag=1;
while(flag)
disp('For DIGITS COUNT function enter 1');
disp('For AVERAGE function enter 2');
disp('For PRIME function enter 3');
disp('To EXIT enter 4');
prompt = 'your choice: ';
choice = input(prompt);
switch (choice)

case 1

prompt = 'Enter a positive number to calculate digits and sum: ';
N = input(prompt);
nd=numel(num2str(N)); %numel is used focalulating number of element in string and num2str convert number to string
  
while(N<0 || nd<5)
if(N<0)
prompt = 'Number entered should be positive, re-enter number ';
N = input(prompt);
end
if(nd<5)
prompt = 'Number entered should have more than 4 digits, re-enter number ';
N = input(prompt);
end
nd=numel(num2str(N));
end
  
[ number_digits,sum_digits ] = digits_function( N );
fprintf('The number of digits is: = %d\n',number_digits);
fprintf('The sum of digits is: = %d\n\n',sum_digits);
  
case 2

prompt = 'Enter the first input ';
a = input(prompt);
prompt = 'Enter the second input ';
b = input(prompt);
prompt = 'Enter the third input ';
c = input(prompt);
prompt = 'Enter the forth input ';
d = input(prompt);
  
average_function( a,b,c,d);
  
  
case 3

prompt = 'Enter a number to check if it is prime: ';
x = input(prompt);   
while(x<1 || x==1)
prompt = 'Number entered should be greater than 1, re-enter number ';
x = input(prompt);
end
  
[ result_prime ] = prime_function( x );
if(result_prime==1)
fprintf('%d is a prime number\n\n',x);
else
fprintf('%d is not a prime number\n\n',x);
end
case 4
flag=0;
break;
  
otherwise
disp('invalid option, re-enter your option');
fprintf('\n\n');
  
end
  
  

1. digits_function

function [ number_digits,sum_digits ] = digits_function( N )
nd=numel(num2str(N)); %numel is used focalulating number of element in string and num2str convert number to string
sd=0;
b=num2str(N); %num2str convert number to string;
for i=1:nd
str = str2double(b(i)); %string2double convert stinrg to double so that we can add it
sd=sd+str; %sd=sd+b(i) this we cannot write as the value of b(i) is considered to be ASCII value of int
end
number_digits=nd;
sum_digits=sd;

end

2. print_average_function

function average_function( a,b,c,d)
sum=a+b+c+d; %first we add all 4 variable then minus then if they fall in fallowing four cases
count=4;
if (a==0 || a>10) %given condition value should not ne 0 or greater than 10
count=count-1;
sum=sum-a;
end
if (b==0 || b>10 )
count=count-1;
sum=sum-b;
end
if (c==0 || c>10)
count=count-1;
sum=sum-c;
end
if (d==0 || d>10)
count=count-1;
sum=sum-d;
end

if(count~=0)
avg=sum/count;

end

fprintf('The average is: %d\n\n',avg);
end