Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.21)
// Compass (v1.0.3)
// ----

/*
  Sum of first n natural numbers
  (c) Donald Leung.  All rights reserved.
*/

// Code

@function sum($n) {
  @return $n * ($n + 1) / 2;
}

// Pseudo-test cases

.test-1 {
  n: 1;
  expected: 1;
  actual: sum(1);
  pass: sum(1) == 1;
}

.test-2 {
  n: 10;
  expected: 55;
  actual: sum(10);
  pass: sum(10) == 55;
}

.test-3 {
  n: 100;
  expected: 5050;
  actual: sum(100);
  pass: sum(100) == 5050;
}

.test-4 {
  n: 666;
  expected: 222111;
  actual: sum(666);
  pass: sum(666) == 222111;
}

SassMeister-output.css

/*
  Sum of first n natural numbers
  (c) Donald Leung.  All rights reserved.
*/
.test-1 {
  n: 1;
  expected: 1;
  actual: 1;
  pass: true;
}

.test-2 {
  n: 10;
  expected: 55;
  actual: 55;
  pass: true;
}

.test-3 {
  n: 100;
  expected: 5050;
  actual: 5050;
  pass: true;
}

.test-4 {
  n: 666;
  expected: 222111;
  actual: 222111;
  pass: true;
}