{
    "cells": [
        {
            "cell_type": "markdown",
            "metadata": {},
            "source": ["# Trinary\n", "\n", "Convert a trinary number, represented as a string (e.g. '102012'), to its\n", "decimal equivalent using first principles.\n", "\n", "The program should consider strings specifying an invalid trinary as the\n", "value 0.\n", "\n", "Trinary numbers contain three symbols: 0, 1, and 2.\n", "\n", "The last place in a trinary number is the 1's place. The second to last\n", "is the 3's place, the third to last is the 9's place, etc.\n", "\n", "```shell\n", "# \"102012\"\n", "    1       0       2       0       1       2    # the number\n", "1*3^5 + 0*3^4 + 2*3^3 + 0*3^2 + 1*3^1 + 2*3^0    # the value\n", "  243 +     0 +    54 +     0 +     3 +     2 =  302\n", "```\n", "\n", "If your language provides a method in the standard library to perform the\n", "conversion, pretend it doesn't exist and implement it yourself.\n", "\n", "## Source\n", "\n", "All of Computer Science [http://www.wolframalpha.com/input/?i=binary&a=*C.binary-_*MathWorld-](http://www.wolframalpha.com/input/?i=binary&a=*C.binary-_*MathWorld-)\n", "\n", "## Version compatibility\n", "This exercise has been tested on Julia versions >=1.0.\n", "\n", "## Submitting Incomplete Solutions\n", "It's possible to submit an incomplete solution so you can see how others have completed the exercise."]
        },
        {
            "cell_type": "markdown",
            "metadata": {},
            "source": ["## Your solution"]
        },
        {
            "cell_type": "code",
            "execution_count": null,
            "metadata": {},
            "outputs": [],
            "source": ["# submit\n", "function trinary_to_decimal(str)\n", "\n", "end"]
        },
        {
            "cell_type": "markdown",
            "metadata": {},
            "source": ["## Test suite"]
        },
        {
            "cell_type": "code",
            "execution_count": null,
            "metadata": {},
            "outputs": [],
            "source": ["using Test\n", "\n", "# include(\"trinary.jl\")\n", "\n", "@testset \"trinary 1 is decimal 1\" begin\n", "    @test trinary_to_decimal(\"1\") == 1\n", "end\n", "\n", "@testset \"trinary 2 is decimal 2\" begin\n", "    @test trinary_to_decimal(\"2\") == 2\n", "end\n", "\n", "@testset \"trinary 10 is decimal 3\" begin\n", "    @test trinary_to_decimal(\"10\") == 3\n", "end\n", "\n", "@testset \"trinary 11 is decimal 4\" begin\n", "    @test trinary_to_decimal(\"11\") == 4\n", "end\n", "\n", "@testset \"trinary 100 is decimal 9\" begin\n", "    @test trinary_to_decimal(\"100\") == 9\n", "end\n", "\n", "@testset \"trinary 112 is decimal 14\" begin\n", "    @test trinary_to_decimal(\"112\") == 14\n", "end\n", "\n", "@testset \"trinary 222 is decimal 26\" begin\n", "    @test trinary_to_decimal(\"222\") == 26\n", "end\n", "\n", "@testset \"trinary 1122000120 is decimal 32091\" begin\n", "    @test trinary_to_decimal(\"1122000120\") == 32091\n", "end\n", "\n", "@testset \"invalid trinary digits returns 0\" begin\n", "    @test trinary_to_decimal(\"1234\") == 0\n", "end\n", "\n", "@testset \"invalid word as input returns 0\" begin\n", "    @test trinary_to_decimal(\"carrot\") == 0\n", "end\n", "\n", "@testset \"invalid numbers with letters as input returns 0\" begin\n", "    @test trinary_to_decimal(\"0a1b2c\") == 0\n", "end"]
        },
        {
            "cell_type": "markdown",
            "metadata": {},
            "source": [
                "## Prepare submission\n",
                "To submit your exercise, you need to save your solution in a file called `trinary.jl` before using the CLI.\n",
                "You can either create it manually or use the following functions, which will automatically write every notebook cell that starts with `# submit` to the file `trinary.jl`.\n"
            ]
        },
        {
            "cell_type": "code",
            "execution_count": null,
            "metadata": {},
            "outputs": [],
            "source": [
                "# using Pkg; Pkg.add(\"Exercism\")\n",
                "# using Exercism\n",
                "# Exercism.create_submission(\"trinary\")"
            ]
        }
    ],
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            "display_name": "Julia 1.3.0",
            "language": "julia",
            "name": "julia-1.3"
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            "file_extension": ".jl",
            "mimetype": "application/julia",
            "name": "julia",
            "version": "1.3.0"
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