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

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BeTrayer EK on 28 May 2015
Commented: BeTrayer EK on 28 May 2015
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

B.k Sumedha on 28 May 2015
Edited: Andrei Bobrov on 28 May 2015
clc
num1 =input('Enter num1 value ');
num2 =input('Enter num2 value ');
n = num1 : num2;
p = isprime(n);
n(p) %displays the primes
BeTrayer EK on 28 May 2015
Hi if lets say my matlab dont have the "isprime" how do i do with it ?
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.

B.k Sumedha on 28 May 2015
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

B.k Sumedha on 28 May 2015
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) = []
BeTrayer EK on 28 May 2015
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