Ruby program to check whether the given number is prime or not

Checking prime number

What is Prime number?

Prime numbers are those numbers which can only be divisible by itself or 1

puts "Enter the number:"
num=gets.chomp.to_i
count=0
if (num==0)
    puts "0 is not prime"
else
    
    i=2
    while(i<num)
        if (num%i==0)
            count+=1
        end
        i+=1
    end
    
end
    if count>1
        puts "#{num} is not a prime number"
    else
        puts "#{num} is a prime number"
    end

 

Output

Enter the number:
2
2 is a prime number

 

Enter the number:
 11
11 is a prime number

 


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