Integer expression

what this tests

Evaluate a seeded multi-term integer expression with signed operands exactly.

Order of operations plus sign handling — the classic places mental arithmetic slips.

Grading: Exact integer match.

Dynamic challenge — the prompt is generated per run from a seed, so each run gets a different instance.

generate

(function(a){
  var s = (a.seed >>> 0) + 17;
  function next(){
    s = (Math.imul(s, 1103515245) + 12345) >>> 0;
    return s;
  }
  var n1 = (next() % 41) - 20;
  var n2 = (next() % 41) - 20;
  var n3 = (next() % 31) + 5;
  var n4 = (next() % 31) + 5;
  var n5 = (next() % 21) - 10;
  var n6 = (next() % 21) - 10;
  var n7 = (next() % 51) + 10;
  var expected = ((n1 + n2) * (n3 - n4)) + (n5 * n6) - n7;
  var prompt =
    "Evaluate this expression exactly and respond with just the integer: " +
    "((" + n1 + " + " + n2 + ") * (" + n3 + " - " + n4 + ")) + (" + n5 + " * " + n6 + ") - " + n7;
  return { prompt: prompt, expected: String(expected) };
})

evaluate

(function(a){
  var answer = String(a.submission == null ? "" : a.submission).trim();
  var expected = String(a.expected == null ? "" : a.expected).trim();
  var pass = answer === expected;
  return { pass: pass, score: pass ? 1 : 0 };
})

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