Add practice exercise resistor-color-expert

config.json

@@ -488,6 +488,16 @@
         ],
         "difficulty": 2
       },
+      {
+        "slug": "resistor-color-expert",
+        "name": "Resistor Color Expert",
+        "uuid": "9be3fb37-9b52-4e23-bb4f-0c7a8c4c3299",
+        "practices": [],
+        "prerequisites": [
+          "arrays"
+        ],
+        "difficulty": 2
+      },
       {
         "slug": "rna-transcription",
         "name": "RNA Transcription",

exercises/practice/resistor-color-expert/.docs/instructions.md

@@ -0,0 +1,79 @@
+# Instructions
+
+In this exercise, you are going to create a helpful program so that you don't have to remember the values of the bands.
+The program will take 1, 4, or 5 colors as input, and outputs the correct value, in ohms.
+The color bands are encoded as follows:
+
+- Black: 0
+- Brown: 1
+- Red: 2
+- Orange: 3
+- Yellow: 4
+- Green: 5
+- Blue: 6
+- Violet: 7
+- Grey: 8
+- White: 9
+
+In `resistor-color trio` you decoded the first three colors.
+For instance: orange-orange-brown translated to the main value `330`.
+In this exercise you will need to add _tolerance_ to the mix.
+Tolerance is the maximum amount that a value can be above or below the main value.
+For example, if the last band is green, the maximum tolerance will be ±0.5%.
+
+The tolerance band will have one of these values:
+
+- Grey - 0.05%
+- Violet - 0.1%
+- Blue - 0.25%
+- Green - 0.5%
+- Brown - 1%
+- Red - 2%
+- Gold - 5%
+- Silver - 10%
+
+The four-band resistor is built up like this:
+
+| Band_1  | Band_2  | Band_3     | band_4    |
+| ------- | ------- | ---------- | --------- |
+| Value_1 | Value_2 | Multiplier | Tolerance |
+
+Meaning
+
+- orange-orange-brown-green would be 330 ohms with a ±0.5% tolerance.
+- orange-orange-red-grey would be 3300 ohms with ±0.05% tolerance.
+
+The difference between a four and five-band resistor is that the five-band resistor has an extra band to indicate a more precise value.
+
+| Band_1  | Band_2  | Band_3  | Band_4     | band_5    |
+| ------- | ------- | ------- | ---------- | --------- |
+| Value_1 | Value_2 | Value_3 | Multiplier | Tolerance |
+
+Meaning
+
+- orange-orange-orange-black-green would be 333 ohms with a ±0.5% tolerance.
+- orange-red-orange-blue-violet would be 323M ohms with a ±0.10 tolerance.
+
+There are also one band resistors.
+One band resistors only have the color black with a value of 0.
+
+This exercise is about translating the resistor band colors into a label:
+
+"... ohms ...%"
+
+So an input of "orange", "orange", "black", "green" should return:
+
+"33 ohms ±0.5%"
+
+When there are more than a thousand ohms, we say "kiloohms".
+ That's similar to saying "kilometer" for 1000 meters, and "kilograms" for 1000 grams.
+
+So an input of "orange", "orange", "orange", "grey" should return:
+
+"33 kiloohms ±0.05%"
+
+When there are more than a million ohms, we say "megaohms".
+
+So an input of "orange", "orange", "blue", "red" should return:
+
+"33 megaohms ±2%"

exercises/practice/resistor-color-expert/.docs/introduction.md

@@ -0,0 +1,10 @@
+# Introduction
+
+If you want to build something using a Raspberry Pi, you'll probably use _resistors_.
+Like the previous `Resistor Color Duo` and `Resistor Color Trio` exercises, you will be translating resistor color bands to human-readable labels.
+
+- Each resistor has a resistance value.
+- Resistors are small - so small in fact that if you printed the resistance value on them, it would be hard to read.
+  To get around this problem, manufacturers print color-coded bands onto the resistors to denote their resistance values.
+- Each band acts as a digit of a number.
+  For example, if they printed a brown band (value 1) followed by a green band (value 5), it would translate to the number 15.

exercises/practice/resistor-color-expert/.meta/config.json

@@ -0,0 +1,22 @@
+{
+  "authors": [
+      "manumafe98"
+  ],
+  "files": {
+    "solution": [
+      "src/main/java/ResistorColorExpert.java"
+    ],
+    "test": [
+      "src/test/java/ResistorColorExpertTest.java"
+    ],
+    "example": [
+      ".meta/src/reference/java/ResistorColorExpert.java"
+    ],
+    "invalidator": [
+      "build.gradle"
+    ]
+  },
+  "blurb": "Convert color codes as used on resistors with different bands to a human-readable label.",
+  "source": "Based on earlier resistor color exercises made by Erik Schierboom and Maud de Vries",
+  "source_url": "https://github.com/exercism/problem-specifications/issues/1464"
+}

exercises/practice/resistor-color-expert/.meta/src/reference/java/ResistorColorExpert.java

@@ -0,0 +1,3 @@
+class ResistorColorExpert {
+
+}

exercises/practice/resistor-color-expert/src/main/java/ResistorColorExpert.java

@@ -0,0 +1,3 @@
+class ResistorColorExpert {
+
+}

exercises/practice/resistor-color-expert/src/test/java/ResistorColorExpertTest.java

@@ -0,0 +1,3 @@
+public class ResistorColorExpertTest {
+
+}

exercises/settings.gradle

@@ -118,6 +118,7 @@ include 'practice:rectangles'
 include 'practice:resistor-color'
 include 'practice:resistor-color-duo'
 include 'practice:resistor-color-trio'
+include 'practice:resistor-color-expert'
 include 'practice:rest-api'
 include 'practice:reverse-string'
 include 'practice:rna-transcription'