ssnravi

first_num = 2
last_num = 20

def prime? num
  return false if num <=1
  2.upto(num/2).each { |y| return false if  num % y == 0}
  true
end

first_num.upto(last_num) do |temp|

ssnravi

arr = ["apple", "bananna", "pineapple", "orange"]

puts arr.sort_by {|x| x.length}

ssnravi

s = "I am Ravi Suraneni"

def count_word_characters(s)
    h = Hash.new(0)
    s.downcase.each_char do |char| 
        next unless char =~/\w/
        h[char] += 1
    end
    h

ssnravi

student = {"First Name:" => "John",
          "Last Nmae:" => "Doe",
          "Subjects:" => "Physics, Chemistry, Maths",
          "Marks:" => "Physics: 75, Maths: 85, Chemistry: 98"
  }

student.each {|key, value| puts   key, student[key]}

ssnravi

num = 1000

def prime? num
  return false if num <=1
  2.upto(num/2).each { |y| return false if  num % y == 0}
  true
end

temp = 1

ssnravi

print "Enter your string: "
string = gets.chomp

if string == string.reverse
  puts "#{string} is a pallindrome"
else
  puts "#{string} is not a pallindrome"
end

ssnravi

#Factorial: n! = n*(n-1)*(n-2)*...1

print "Enter a number: "
num = gets.chomp.to_i
fact = 1
puts "Factorial for #{num} is: "
num.downto(1) {|x| fact *= x}
puts fact

ssnravi

print "Enter first number here: "
first_num = gets.chomp.to_i

print "Enter second number here: "
second_num = gets.chomp.to_i

puts "GCD of #{first_num} and #{second_num} is: "

temp=1

ssnravi

print "Enter a number here: "
num = gets.chomp.to_i

prime = true

2.upto(math.sqrt(num)).each do |x|
    if num % x == 0
      not_prime = false
      break
    end

ssnravi

x=10
x.downto(1) {|n| print n, " "}

x=8
y=12
puts x.gcd(y)

x=8
puts x.next