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14 changes: 14 additions & 0 deletions
14
exercises/practice/armstrong-numbers/.docs/instructions.md
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# Instructions | ||
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An [Armstrong number][armstrong-number] is a number that is the sum of its own digits each raised to the power of the number of digits. | ||
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For example: | ||
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- 9 is an Armstrong number, because `9 = 9^1 = 9` | ||
- 10 is _not_ an Armstrong number, because `10 != 1^2 + 0^2 = 1` | ||
- 153 is an Armstrong number, because: `153 = 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153` | ||
- 154 is _not_ an Armstrong number, because: `154 != 1^3 + 5^3 + 4^3 = 1 + 125 + 64 = 190` | ||
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Write some code to determine whether a number is an Armstrong number. | ||
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[armstrong-number]: https://en.wikipedia.org/wiki/Narcissistic_number |
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{ | ||
"authors": [ | ||
"BNAndras" | ||
], | ||
"files": { | ||
"solution": [ | ||
"armstrong_numbers.bal" | ||
], | ||
"test": [ | ||
"tests/armstrong_numbers_test.bal" | ||
], | ||
"example": [ | ||
".meta/reference/armstrong_numbers.bal" | ||
] | ||
}, | ||
"blurb": "Determine if a number is an Armstrong number.", | ||
"source": "Wikipedia", | ||
"source_url": "https://en.wikipedia.org/wiki/Narcissistic_number" | ||
} |
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exercises/practice/armstrong-numbers/.meta/reference/armstrong_numbers.bal
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public function isArmstrongNumber(int number) returns boolean { | ||
int sum = 0; | ||
int working = number; | ||
float length = <float> number.toString().length(); | ||
while (working > 0) { | ||
float digit = <float> working % 10; | ||
sum += <int> float:pow(digit, length); | ||
working /= 10; | ||
} | ||
return sum == number; | ||
} |
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# This is an auto-generated file. | ||
# | ||
# Regenerating this file via `configlet sync` will: | ||
# - Recreate every `description` key/value pair | ||
# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications | ||
# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion) | ||
# - Preserve any other key/value pair | ||
# | ||
# As user-added comments (using the # character) will be removed when this file | ||
# is regenerated, comments can be added via a `comment` key. | ||
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[c1ed103c-258d-45b2-be73-d8c6d9580c7b] | ||
description = "Zero is an Armstrong number" | ||
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[579e8f03-9659-4b85-a1a2-d64350f6b17a] | ||
description = "Single-digit numbers are Armstrong numbers" | ||
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[2d6db9dc-5bf8-4976-a90b-b2c2b9feba60] | ||
description = "There are no two-digit Armstrong numbers" | ||
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[509c087f-e327-4113-a7d2-26a4e9d18283] | ||
description = "Three-digit number that is an Armstrong number" | ||
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[7154547d-c2ce-468d-b214-4cb953b870cf] | ||
description = "Three-digit number that is not an Armstrong number" | ||
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[6bac5b7b-42e9-4ecb-a8b0-4832229aa103] | ||
description = "Four-digit number that is an Armstrong number" | ||
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[eed4b331-af80-45b5-a80b-19c9ea444b2e] | ||
description = "Four-digit number that is not an Armstrong number" | ||
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[f971ced7-8d68-4758-aea1-d4194900b864] | ||
description = "Seven-digit number that is an Armstrong number" | ||
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[7ee45d52-5d35-4fbd-b6f1-5c8cd8a67f18] | ||
description = "Seven-digit number that is not an Armstrong number" | ||
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[5ee2fdf8-334e-4a46-bb8d-e5c19c02c148] | ||
description = "Armstrong number containing seven zeroes" | ||
include = false | ||
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[12ffbf10-307a-434e-b4ad-c925680e1dd4] | ||
description = "The largest and last Armstrong number" | ||
include = false |
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[package] | ||
org = "ballerina_exercism" | ||
name = "armstrong_numbers" | ||
version = "0.1.0" | ||
distribution = "2201.5.0" |
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# AUTO-GENERATED FILE. DO NOT MODIFY. | ||
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# This file is auto-generated by Ballerina for managing dependency versions. | ||
# It should not be modified by hand. | ||
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[ballerina] | ||
dependencies-toml-version = "2" | ||
distribution-version = "2201.5.0" | ||
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[[package]] | ||
org = "ballerina" | ||
name = "jballerina.java" | ||
version = "0.0.0" | ||
scope = "testOnly" | ||
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[[package]] | ||
org = "ballerina" | ||
name = "test" | ||
version = "0.0.0" | ||
scope = "testOnly" | ||
dependencies = [ | ||
{org = "ballerina", name = "jballerina.java"} | ||
] | ||
modules = [ | ||
{org = "ballerina", packageName = "test", moduleName = "test"} | ||
] | ||
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[[package]] | ||
org = "ballerina_exercism" | ||
name = "armstrong_numbers" | ||
version = "0.1.0" | ||
dependencies = [ | ||
{org = "ballerina", name = "test"} | ||
] | ||
modules = [ | ||
{org = "ballerina_exercism", packageName = "armstrong_numbers", moduleName = "armstrong_numbers"} | ||
] | ||
|
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public function isArmstrongNumber(int number) returns boolean { | ||
// TODO: implement this function | ||
} |
63 changes: 63 additions & 0 deletions
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exercises/practice/armstrong-numbers/tests/armstrong_numbers_test.bal
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import ballerina/test; | ||
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@test:Config | ||
function testZeroIsArmstrongNumber() { | ||
test:assertTrue(isArmstrongNumber(0)); | ||
} | ||
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@test:Config { | ||
enable: false | ||
} | ||
function testSingleDigitIsArmstrongNumber() { | ||
test:assertTrue(isArmstrongNumber(5)); | ||
} | ||
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@test:Config { | ||
enable: false | ||
} | ||
function testTwoDigitIsNotArmstrongNumber() { | ||
test:assertFalse(isArmstrongNumber(10)); | ||
} | ||
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@test:Config { | ||
enable: false | ||
} | ||
function testThreeDigitIsArmstrongNumber() { | ||
test:assertTrue(isArmstrongNumber(153)); | ||
} | ||
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@test:Config { | ||
enable: false | ||
} | ||
function testThreeDigitIsNotArmstrongNumber() { | ||
test:assertFalse(isArmstrongNumber(100)); | ||
} | ||
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@test:Config { | ||
enable: false | ||
} | ||
function testFourDigitIsArmstrongNumber() { | ||
test:assertTrue(isArmstrongNumber(9474)); | ||
} | ||
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@test:Config { | ||
enable: false | ||
} | ||
function testFourDigitIsNotArmstrongNumber() { | ||
test:assertFalse(isArmstrongNumber(9475)); | ||
} | ||
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@test:Config { | ||
enable: false | ||
} | ||
function testSevenDigitIsArmstrongNumber() { | ||
test:assertTrue(isArmstrongNumber(9926315)); | ||
} | ||
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@test:Config { | ||
enable: false | ||
} | ||
function testSevenDigitIsNotArmstrongNumber() { | ||
test:assertFalse(isArmstrongNumber(9926314)); | ||
} |