Fraction Math in Go

Welcome to the Fraction Math in Go page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

package main

import (
	"os"
	"math/big"
	"strings"
	"strconv"
)

func die(msg string) {
	println(msg)
	os.Exit(1)
}

func main() {
	if len(os.Args) != 4 {
		die("Usage: ./fraction-math operand1 operator operand2")
	}

	o1str := strings.Split(os.Args[1], "/")
	if len(o1str) != 2 {
		die("Invalid operand: " + os.Args[1])
	}

	o2str := strings.Split(os.Args[3], "/")
	if len(o2str) != 2 {
		die("Invalid operand: " + os.Args[3])
	}

	operator := os.Args[2]

	a, err := strconv.Atoi(o1str[0])
	if err != nil {
		die("Invalid operand: " + os.Args[1])
	}
	b, err := strconv.Atoi(o1str[1])
	if err != nil {
		die("Invalid operand: " + os.Args[1])
	}

	o1 := big.NewRat(int64(a), int64(b))

	a, err = strconv.Atoi(o2str[0])
	if err != nil {
		die("Invalid operand: " + os.Args[1])
	}
	b, err = strconv.Atoi(o2str[1])
	if err != nil {
		die("Invalid operand: " + os.Args[1])
	}

	o2 := big.NewRat(int64(a), int64(b))

	switch operator {
	case "+":
		println(o1.Add(o1, o2).RatString())
	case "-":
		println(o1.Sub(o1, o2).RatString())
	case "*":
		println(o1.Mul(o1, o2).RatString())
	case "/":
		println(o1.Mul(o1, o2.Inv(o2)).RatString())
	case ">":
		if o1.Cmp(o2) == -1 || o1.Cmp(o2) == 0 {
			println(0)
		} else if o1.Cmp(o2) == 1 {
			println(1)
		}
	case "<":
		if o1.Cmp(o2) == 1 {
			println(0)
		} else if o1.Cmp(o2) == -1 || o1.Cmp(o2) == 0 {
			println(1)
		}
	case "==":
		if o1.Cmp(o2) == 0 {
			println(1)
		} else {
			println(0)
		}
	case "!=":
		if o1.Cmp(o2) == 0 {
			println(0)
		} else {
			println(1)
		}
	case ">=":
		if o1.Cmp(o2) == 1 || o1.Cmp(o2) == 0 {
			println(1)
		} else {
			println(0)
		}
	case "<=":
		if o1.Cmp(o2) == -1 || o1.Cmp(o2) == 0 {
			println(1)
		} else {
			println(0)
		}
	}
}

Fraction Math in Go was written by:

• Zia

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

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