37: Add solution for Rust track exercise "Armstrong Numbers".

Dependencies

• [2] QK6XE5XF 13: Add Rust track exercises "Beer Song", "Proverb", "Difference Of Squares", "Sum Of Multiples", "Grains", "Prime Factors", "Armstrong Numbers" and "Reverse String".

Change contents

• replacement in rust/armstrong-numbers/tests/armstrong-numbers.rs at line 5
  [2.54201]→[2.54201:54237](∅→∅)
  − assert!(is_armstrong_number(0))
  [2.54201]

  [2.54237]
  + assert!(is_armstrong_number(0))
• replacement in rust/armstrong-numbers/tests/armstrong-numbers.rs at line 11
  [2.54313]→[2.54313:54349](∅→∅)
  − assert!(is_armstrong_number(5))
  [2.54313]

  [2.54349]
  + assert!(is_armstrong_number(5))
• replacement in rust/armstrong-numbers/tests/armstrong-numbers.rs at line 17
  [2.54421]→[2.54421:54459](∅→∅)
  − assert!(!is_armstrong_number(10))
  [2.54421]

  [2.54459]
  + assert!(!is_armstrong_number(10))
• replacement in rust/armstrong-numbers/tests/armstrong-numbers.rs at line 23
  [2.54521]→[2.54521:54559](∅→∅)
  − assert!(is_armstrong_number(153))
  [2.54521]

  [2.54559]
  + assert!(is_armstrong_number(153))
• replacement in rust/armstrong-numbers/tests/armstrong-numbers.rs at line 29
  [2.54625]→[2.54625:54664](∅→∅)
  − assert!(!is_armstrong_number(100))
  [2.54625]

  [2.54664]
  + assert!(!is_armstrong_number(100))
• replacement in rust/armstrong-numbers/tests/armstrong-numbers.rs at line 35
  [2.54725]→[2.54725:54764](∅→∅)
  − assert!(is_armstrong_number(9474))
  [2.54725]

  [2.54764]
  + assert!(is_armstrong_number(9474))
• replacement in rust/armstrong-numbers/tests/armstrong-numbers.rs at line 41
  [2.54829]→[2.54829:54869](∅→∅)
  − assert!(!is_armstrong_number(9475))
  [2.54829]

  [2.54869]
  + assert!(!is_armstrong_number(9475))
• replacement in rust/armstrong-numbers/tests/armstrong-numbers.rs at line 47
  [2.54931]→[2.54931:54975](∅→∅)
  − assert!(is_armstrong_number(9_926_315))
  [2.54931]

  [2.54975]
  + assert!(is_armstrong_number(9_926_315))
• replacement in rust/armstrong-numbers/tests/armstrong-numbers.rs at line 53
  [2.55041]→[2.55041:55086](∅→∅)
  − assert!(!is_armstrong_number(9_926_316))
  [2.55041]

  [2.55086]
  + assert!(!is_armstrong_number(9_926_316))
• edit in rust/armstrong-numbers/src/lib.rs at line 1
  [2.55136]

  [2.55137]
  + /* pub fn is_armstrong_number(num: u32) -> bool {

  + let digits: Vec<u32> = num

  + .to_string()

  + .chars()

  + .map(|character| character.to_digit(10).unwrap())

  + .collect();

  + digits

  + .iter()

  + .map(|digit| digit.pow(digits.len() as u32))

  + .sum::<u32>()

  + == num

  + } */

  +
• replacement in rust/armstrong-numbers/src/lib.rs at line 15
  [2.55184]→[2.55184:55245](∅→∅)
  − unimplemented!("true if {} is an armstrong number", num)
  [2.55184]

  [2.55245]
  + [

  + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407, 1634, 8208, 9474, 54748, 92727, 93084,

  + 548834, 1741725, 4210818, 9800817, 9926315, 24678050, 24678051, 88593477, 146511208,

  + 472335975, 534494836,

  + 912985153,

  + /* 4679307774,

  + 32164049650,

  + 32164049651,

  + 40028394225,

  + 42678290603,

  + 44708635679,

  + 49388550606,

  + 82693916578,

  + 94204591914,

  + 28116440335967,

  + 4338281769391370,

  + 4338281769391371,

  + 21897142587612075,

  + 35641594208964132,

  + 35875699062250035,

  + 1517841543307505039,

  + 3289582984443187032,

  + 4498128791164624869,

  + 4929273885928088826,

  + 63105425988599693916,

  + 128468643043731391252,

  + 449177399146038697307,

  + 21887696841122916288858,

  + 27879694893054074471405,

  + 27907865009977052567814,

  + 28361281321319229463398,

  + 35452590104031691935943,

  + 174088005938065293023722,

  + 188451485447897896036875,

  + 239313664430041569350093,

  + 1550475334214501539088894,

  + 1553242162893771850669378,

  + 3706907995955475988644380,

  + 3706907995955475988644381,

  + 4422095118095899619457938,

  + 121204998563613372405438066,

  + 121270696006801314328439376,

  + 128851796696487777842012787,

  + 174650464499531377631639254,

  + 177265453171792792366489765,

  + 14607640612971980372614873089,

  + 19008174136254279995012734740,

  + 19008174136254279995012734741,

  + 23866716435523975980390369295,

  + 1145037275765491025924292050346,

  + 1927890457142960697580636236639,

  + 2309092682616190307509695338915,

  + 17333509997782249308725103962772,

  + 186709961001538790100634132976990,

  + 186709961001538790100634132976991,

  + 1122763285329372541592822900204593,

  + 12639369517103790328947807201478392,

  + 12679937780272278566303885594196922,

  + 1219167219625434121569735803609966019,

  + 12815792078366059955099770545296129367,

  + 115132219018763992565095597973971522400,

  + 115132219018763992565095597973971522401, */

  + ]

  + .iter()

  + .any(|&number| num == number)