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# File 'lib/math_func.rb', line 14
def func
fact = Inherit.new
prompt = "Enter a number between the given range"
loop do
print "Menu:\n1 : Armstrong Number\n2 : Factorial\n3 : Prime Number\n4 : Pascal Triangle\n0 : Exit\nPlease enter your choice : "
selection = gets.to_i
if selection == 1
def Armstrong(n)
num = n
sum = 0
temp = num
while num>0
sum = sum + (num%10) * (num%10) * (num%10)
num = num/10
end
if temp == sum
"#{temp} is an Armstrong Number"
else
"#{temp} is not an Armstrong Number"
end
end
print "Enter a number: "
n = gets.to_i
puts Armstrong(n)
elsif selection == 2
print "Enter your choice:\n1 : Factorial\n2 : ncr\n3 : npr\n"
print "Enter a number between 1 to 3 : "
select = gets.to_i
case select
when 1
puts"Factorial:"
print "Enter a number: "
n = gets.to_i
print "Factorial of #{n} of is ", fact.factorial(n), "\n\n"
when 2
puts "ncr:"
print "Enter the value of n "
n = gets.to_i
print "Enter the value of r "
r = gets.to_i
res = fact.factorial(n) / (fact.factorial(r))
puts "ncr of given variables is #{res}"
when 3
puts "npr:"
print "Enter the value of n: "
n = gets.to_i
print "Enter the value of r: "
r = gets.to_i
res = fact.factorial(n) / (fact.factorial(r) * fact.factorial(n-r))
puts "ncr of given variables is #{res}"
end
elsif selection == 3
print "Enter a number \t"
n = gets.to_i
def prime(n)
puts "That's not an integer." unless n.is_a? Integer
is_prime = true
for i in 2..n-1
if n % i == 0
is_prime = false
end
end
if is_prime
puts "#{n} is prime!"
else
puts "#{n} is not prime."
end
end
prime(n)
elsif selection == 4
print "Enter how many rows you want: "
n = gets.to_i
def triangle(n)
fact = Inherit.new
for i in (0..n)
for j in (0..n-i-1)
print " "
end
for j in (0..i)
res = fact.factorial(i)/(fact.factorial(j) * fact.factorial(i-j))
print res
print " "
end
puts "\n"
end
end
triangle(n)
elsif selection == 0
puts "Thank you"
break
else
print "Enter a number from the given range only"
redo
end
end
end
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