Question

Using Matlab

1. Write a function, called digits_function that is able to calculate the number of digits and the multiplication of the digits. The input of this function is N (entered number) and the outputs are number_digits and sum_digits.

2. Write a function, called print_Min_function that is able to print the minimum of 3 numbers. The inputs of this function are a, b and c.

3. Write a function, called prime_function that receives one parameter n, and checks whether the number is prime or not. The input of this function is n and the output is result_prime.

4. 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

1. To use the digits function you have to enter 1.
2. To use the minimum function you have to enter 2.
3. To use the prime function you have to enter 3.
4. 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 minimum function, you have to enter greater than or equal to zero values and for the prime function you have to enter greater than 1 values.

For all of the functions, the program should ask the user to re-enter again if the user entered wrong numbers.

Answer 1

Function Code

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function [d,p] = digits_function(n)
dd = num2str(n) - '0';
d = length(dd);
p = sum(dd);
end

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function y = print_Min_function(f,s,th)
a = [f;s;th];
y = min(a);
end

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function y = prime_function(n)
if(isprime(n))
disp('Number is Prime')
fprintf('\n')
y = n;
else
disp('Number is not Prime')
fprintf('\n')
y = n;
end
end
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Script Code

while(1)
disp('To use the digits function you have to enter 1.')
disp('To use the minimum function you have to enter 2.')
disp('To use the prime function you have to enter 3.')
num = input('Enter Your Choice: ');
if(num>4)
continue;
elseif(num==4)
break;
end
fprintf('\n')
if(num==1)
x = input('Enter number: ');
if(x<0)
continue;
end
[number_digits ,sum_digits] = digits_function(x);
fprintf('The number of digits are %.0f\n\n',number_digits)
fprintf('Sum of digits is %.2f\n\n',sum_digits)
elseif(num==2)
a = input('Enter First number: ');
b = input('Enter Second number: ');
c = input('Enter Third number: ');
if(a<0 || b<0 || c<0)
continue;
end
min_number = print_Min_function(a,b,c);
fprintf('Minimum number is %.2f\n\n',min_number)
elseif(num==3)
d = input('Enter number: ');
if(d<2)
continue;
end
result_prime = prime_function(d);
else
end
end

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Results

No output with invalid inputs

Exits when 4 is entered

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