Make executable the fractional_calculator.rb

chmod +x bin/fractional_calculator.rb

Now you can run the script by this command:

./bin/fractional_calculator.rb

Write a command-line program that takes operations on fractions as input and produces a fractional result.

• The command-line program shall repeatedly prompt the user for input and display the result until user types "exit".
• Legal operators shall be *, /, +, - (multiply, divide, add, subtract).
• Operands and operators shall be separated by one or more spaces.
• Mixed numbers shall be represented by whole&numerator/denominator; for example "3&1/4", "-1&7/8".
• Improper fractions, whole numbers, and negative numbers are allowed as operands.

Example runs (where '?' represents the command prompt):

? 1/2 * 3&3/4

= 1&7/8

? 2&3/8 + 9/8

= 3&1/2

? 1&3/4 - 2

= -1/4