Question

def getPrime(testNumber)
    temp1=testNumber -1;
    bIsPrime = false;
    while (temp1 > 1) do
        bIsPrime = ((testNumber % temp1) == 0)  
        puts("Check 1 #{((testNumber % temp1) == 0)}, temp1=#{temp1} ");
        if ($bIsPrime) 
            break;
        else
            temp1 = temp1-1;
        end
    end
    return bIsPrime
end

puts("Enter any number to know if it's Prime or not");

testNumber = gets()

returnVal = getPrime(Integer(testNumber));

puts("Is enternered number Pime? #{return}");

I have just started with Ruby…So to begin with i tried to write a prime number program.

This thing is giving error “unexpected return”

Any help would be great. Thanks.

Answer 1

although you already have your answer I thought it would be helpful to drop this here, it follows the same idea you’re using in your code:

def is_prime?(test_number)
    (2..test_number-1).reverse_each do |i|
        divisible = (test_number % i == 0)
        puts "Check ##{test_number-i}, divisible=#{divisible}, temp=#{i}"
        return false if divisible
    end
    return true
end
puts "Enter any number to know if it's prime or not"
test_number = gets.chomp.to_i
puts "Is entered number prime? #{is_prime?(test_number)}"