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a guest May 23rd, 2019 66 Never
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  1. package main
  2.  
  3. import (
  4.   "fmt"
  5.   "math"
  6. )
  7.  
  8. func squareOfSum(n float64) float64 {
  9.   /*
  10.    *   n (n + 1)
  11.    * ( --------- ) ** 2
  12.    *       2
  13.    */
  14.   n = ((n * (n + 1)) / 2)
  15.  
  16.   n = math.Pow(math.Floor(n), 2)
  17.  
  18.   return n
  19. }
  20.  
  21. func sumOfSquare(n float64) float64 {
  22.   /*
  23.    *   n (n + 1) (2n + 1)
  24.    * ( ----------------- )
  25.    *            6
  26.    */
  27.    n = (n * (n + 1) * (2 * n + 1)) / 6
  28.  
  29.    return n
  30. }
  31.  
  32. func diff (n float64) float64 {
  33.   /*
  34.    * Square of sum - sum of square of sum
  35.    */
  36.  
  37.   diff := squareOfSum(n) - sumOfSquare(n)
  38.  
  39.   return diff
  40. }
  41.  
  42. func floatToString (n float64) string {
  43.   n = math.Round(n)
  44.  
  45.   str := fmt.Sprintf("%v", n)
  46.  
  47.   return str
  48. }
  49.  
  50. func main() {
  51. fmt.Println("Differentiate V1.0")
  52.  
  53.   fmt.Println("A tool to obtain the difference between the square of the sum and the sum of the squares of a given natural number")
  54.  
  55.   fmt.Println("Built by Paul Adams, 4DAS\n")
  56.  
  57.   for {
  58.     /*
  59.      * Collect input
  60.      */
  61.     var n float64
  62.     fmt.Println("What number should I compare?")
  63.     fmt.Scan(&n)
  64.  
  65.     diff := floatToString(math.Floor(diff(n)))
  66.  
  67.     fmt.Println("\nThe difference is " + diff + "\n")
  68.   }
  69. }
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