Write a command-line program in the language of your choice that will take operations on fractions as an input and produce a fractional result. Legal operators shall be *, /, +, - (multiply, divide, add, subtract) Operands and operators shall be separated by one or more spaces Mixed numbers will be represented by whole_numerator/denominator. e.g. "3_1/4" Improper fractions and whole numbers are also allowed as operands Example run: ? 1/2 * 3_3/4 = 1_7/8 ?2_3/8 + 9/8 = 3_1/2
This is basically just the commandline user interface. Running fcalc without any arguments runs in interactive mode until the user enters "exit." Each line of user input is expected to follow the format of VALUE OP VALUE. A value should be in the format of INT_NUMERATOR/DENOMINATOR. The accepted operators are [*|/|+|-]
running fcalc with a quoted string argument (ex. ruby fcalc.rb "1_1/2 * 1_1/2") operates like a typical unix program returning a string representation of a mixed number and exiting.
I am using a module (Fraction) instead of a class because all we really need to do is convert to an improper fraction and return it as a rational (built in type). When we are done, we convert the rational to a string representation of a mixed number, fraction, or integer.
Fraction provides the functionality to:
- parse a string into an improper fraction.
- create an improper fraction from an integer, numerator and a denominator.
- return a string representation of a mixednumber with reduced fraction.
NOTE: The challenge specifies "whole numbers" rather than integers. This is enforced with Fraction::WHOLE_NUMBERS. If you set this to false it will process integers instead of whole numbers.