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Time - Yesenia #26

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195 changes: 195 additions & 0 deletions calculator.rb
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Original file line number Diff line number Diff line change
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# Yesenia Torres
# calculator.rb

# METHODS ----------

# Check validity of user input
def checkvalidint(num)
if num.to_i.to_s == num
return true
else return false
end
end

def checkvalidfloat(num)
if num.to_f.to_s == num
return true
else return false
end
end

# def convertinput(uncovertednum)
# this method should convert input to either float or int
# end

# Mathematical operations
def add(addnum1, addnum2)
return addnum1 + addnum2
end

def subtract(subnum1, subnum2)
return subnum1 - subnum2
end

def multiply(multiplynum1, multiplynum2)
return multiplynum1 * multiplynum2
end

def divide(divnum1, divnum2)
# Handle int / int = float case
if divnum1%divnum2 != 0
divnum1 = divnum1.to_f
divnum2 = divnum2.to_f
end
return divnum1 / divnum2
end

# --------------------

# Ask for operation
puts "Welcome to the Calculator Program! What math operation would you like me to perform? I can do the following: "
puts "add (+), subtract (-), multiply (*), or divide (/)."
operation = gets.chomp.to_s
until ["add", "+", "subtract", "-", "multiply", "*", "divide", "/"].include?(operation)
puts "Hey buddy, I can't do that. Please only tell me to add (+), subtract (-), multiply (*), or divide(/)."
operation = gets.chomp
end

# Perform operation
case (operation)

# Addition
when "add", "+"
# Get a valid first number
print "Give me a number to add to: "
num1 = gets.chomp
until (checkvalidint(num1) == true) || (checkvalidfloat(num1) == true)
print "Hey bro, that's not a valid number. Please enter a single integer or float: "
num1 = gets.chomp
end
# Convert number to either int or float
if checkvalidint(num1) == true
num1 = num1.to_i
elsif checkvalidfloat(num1) == true
num1 = num1.to_f
end
# Get a valid second number
print "How much would you like to add to that? "
num2 = gets.chomp
until (checkvalidint(num2) == true) || (checkvalidfloat(num2) == true)
print "Hey bro, that's not a valid number. Please enter a single integer or float: "
num2 = gets.chomp
end
# Convert number to either int or float
if checkvalidint(num2) == true
num2 = num2.to_i
elsif checkvalidfloat(num2) == true
num2 = num2.to_f
end
# Print result
puts "#{num1} + #{num2} = #{add(num1, num2)}, you're welcome!"

# Subtraction
when "subtract", "-"

print "Give me a number to subtract from: "
num1 = gets.chomp
until (checkvalidint(num1) == true) || (checkvalidfloat(num1) == true)
print "Hey bro, that's not a valid number. Please enter a single integer or float: "
num1 = gets.chomp
end

if checkvalidint(num1) == true
num1 = num1.to_i
elsif checkvalidfloat(num1) == true
num1 = num1.to_f
end

print "How much would you like to subtract from that? "
num2 = gets.chomp
until (checkvalidint(num2) == true) || (checkvalidfloat(num2) == true)
print "Hey bro, that's not a valid number. Please enter a single integer or float: "
num2 = gets.chomp
end

if checkvalidint(num2) == true
num2 = num2.to_i
elsif checkvalidfloat(num2) == true
num2 = num2.to_f
end

puts "#{num1} - #{num2} = #{subtract(num1, num2)}, you're welcome!"

# Multiplication
when "multiply", "*"

print "Give me a number to multiply: "
num1 = gets.chomp
until (checkvalidint(num1) == true) || (checkvalidfloat(num1) == true)
print "Hey bro, that's not a valid number. Please enter a single integer or float: "
num1 = gets.chomp
end

if checkvalidint(num1) == true
num1 = num1.to_i
elsif checkvalidfloat(num1) == true
num1 = num1.to_f
end

print "How much would you like to multiply that by? "
num2 = gets.chomp
until (checkvalidint(num2) == true) || (checkvalidfloat(num2) == true)
print "Hey bro, that's not a valid number. Please enter a single integer or float: "
num2 = gets.chomp
end

if checkvalidint(num2) == true
num2 = num2.to_i
elsif checkvalidfloat(num2) == true
num2 = num2.to_f
end

puts "#{num1} * #{num2} = #{multiply(num1, num2)}, you're welcome!"

# Division
when "divide", "/"

print "Give me a number to divide by: "
num1 = gets.chomp
until (checkvalidint(num1) == true) || (checkvalidfloat(num1) == true)
print "Hey bro, that's not a valid number. Please enter a single integer or float: "
num1 = gets.chomp
end

if checkvalidint(num1) == true
num1 = num1.to_i
elsif checkvalidfloat(num1) == true
num1 = num1.to_f
end

print "How much would you like to divide that by? "
num2 = gets.chomp
until (checkvalidint(num2) == true) || (checkvalidfloat(num2) == true)
print "Hey bro, that's not a valid number. Please enter a single integer or float: "
num2 = gets.chomp
end

if checkvalidint(num2) == true
num2 = num2.to_i
elsif checkvalidfloat(num2) == true
num2 = num2.to_f
end

puts "#{num1} / #{num2} = #{divide(num1, num2)}, you're welcome!"

end

# Ways to improve:
# - handle numbers that begin with a ".", such as ".08"
# - dry code: make any other methods to delete the repetitiveness?

# Missing Optional Enhancements :
# - Add support for computing exponents (2^4 = 2 * 2 * 2 * 2 = 16)
# - Add support for the modulo operator (10 % 3 = 1).
# - Add support for parentheticals, i.e. 10 / (5 + 5) = 1.
# - Add support for handling all cases (uppercase, capitals) for the operations, so that ADD and add and Add (and other combinations) are handled in the same way