To accept two numbers from the user; Display all prime numbers between these two numbers.

To accept two numbers from the user; Display all prime numbers between these two numbers.

To accept two numbers from the user and display perfect numbers between these two numbers.

To accept two numbers from the user and display Armstrong number between these numbers.

Simple coding using DoWhile, IfElse

Answer 1

[B.k Sumedha]

clc
num1 =input('Enter num1 value ');
num2 =input('Enter num2 value ');
n = num1 : num2;
p = isprime(n);
n(p)    %displays the primes

[BeTrayer EK]

Hi if lets say my matlab dont have the "isprime" how do i do with it ?

How about these 2 more

To accept two numbers from the user and display perfect numbers between these two numbers.

To accept two numbers from the user and display Armstrong number between these numbers.

*thank you for reply and taking your time to read it . very appreciated*

Answer 2

[B.k Sumedha]

Try this for Armstrong number:

clear, clc 

% Let i take two numbers say 100 to 999
for i = 100 : 999

      % We examine every digit in i
      is = num2str(i);

      % i1 is the left-most digit in i
      i1 = str2num(is(1));

      % i2 is the middle digit
      i2 = str2num(is(2));

      % i3 is the right-most digit in i
      i3 = str2num(is(3));

      % We calculate the probable AN
      an = i1^3 + i2^3 + i3^3;

      % We compare to the number itself
      if i == an
          % We display the pair of equal numbers
          disp([i an])
      end
  end

Answer 3

[B.k Sumedha]

This is for perfect numbers where u can change the values of m and n where they are the two input numbers

n=100;
m=10;
output = zeros(1,n);

for i = m:n
    test = 1:i-1;
    if (sum(test(mod(i,test) == 0)) == i)
        output(i) = i;
    end
end
output(output == 0) = []

[B.k Sumedha]

Did u try with these two?

[BeTrayer EK]

Thank you very much B.k Sumedha for answering & taking your time to reply .

but if let say i want the user to input the value any more simple breakdown way i can use ?

Thank you

[BeTrayer EK]

My method for doing single is like that . lets say i want double ?

clear clc

Key=0; Num1 = input('Enter A Number :'); Num2 = input('Enter A Number:'); Count = 1;

while(Count<=Num1)

    if (rem(Num1,Num2,Count)==0)
        Key=Key+1;
    end
    Count = Count + 1;
end
if(Key==2)
    fprintf('%d Is A Prime Number\n' ,Num1);
else
    fprintf('%d NOT A Prime Number\n', Num1);
end