PHP · Theory

sqrt()

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Theory

312/352

sqrt()

Asha only reaches for sqrt() when a sqrt dry-run has to stay correct in a viva board.

Keep sqrt() small. Asha should finish a sqrt dry-run in a few lines, not a 40-line dump.

sqrt() exists so Asha can keep a sqrt dry-run correct in a viva board.

sqrt() shows up in a viva board. Name a sqrt dry-run, not “a real-world scenario”.

sqrt() trap — copy-pasting sqrt without a dry-run. Asha loses marks for that every viva.

sqrt() is not a lonely heading. Asha ties it to a sqrt dry-run.

Viva for sqrt(): what it is → one sqrt step Asha can write from memory → the mistake (copy-pasting sqrt without a dry-run).

Exam tip

Board: a sqrt dry-run. Dry-run sqrt(). Name the trap: copy-pasting sqrt without a dry-run.

Example

<?php
// sqrt()
$scores = [80, 90, 70];
$avg = array_sum($scores) / count($scores);
echo "avg=" . number_format($avg, 1) . "\n";
foreach ($scores as $s) {
  if ($s >= 80) echo "high: $s\n";
}

sqrt(): scores array, print avg, then high marks. Say the output.

Short notes

Defsqrt() — Asha uses it for a sqrt dry-run in a viva board.
Rulesqrt() → one sqrt step Asha can write from memory.
Remembersqrt() + a .php page (a viva board).
Usesqrt() in a viva board (a sqrt dry-run).
Trapsqrt() — copy-pasting sqrt without a dry-run.
Exsqrt() → a sqrt dry-run.

PHP · Theory

sqrt()

← All stacks

Theory

312/352

sqrt()

Asha only reaches for sqrt() when a sqrt dry-run has to stay correct in a viva board.

Keep sqrt() small. Asha should finish a sqrt dry-run in a few lines, not a 40-line dump.

sqrt() exists so Asha can keep a sqrt dry-run correct in a viva board.

sqrt() shows up in a viva board. Name a sqrt dry-run, not “a real-world scenario”.

sqrt() trap — copy-pasting sqrt without a dry-run. Asha loses marks for that every viva.

sqrt() is not a lonely heading. Asha ties it to a sqrt dry-run.

Viva for sqrt(): what it is → one sqrt step Asha can write from memory → the mistake (copy-pasting sqrt without a dry-run).

Exam tip

Board: a sqrt dry-run. Dry-run sqrt(). Name the trap: copy-pasting sqrt without a dry-run.

Example

<?php
// sqrt()
$scores = [80, 90, 70];
$avg = array_sum($scores) / count($scores);
echo "avg=" . number_format($avg, 1) . "\n";
foreach ($scores as $s) {
  if ($s >= 80) echo "high: $s\n";
}

sqrt(): scores array, print avg, then high marks. Say the output.

Short notes

Defsqrt() — Asha uses it for a sqrt dry-run in a viva board.
Rulesqrt() → one sqrt step Asha can write from memory.
Remembersqrt() + a .php page (a viva board).
Usesqrt() in a viva board (a sqrt dry-run).
Trapsqrt() — copy-pasting sqrt without a dry-run.
Exsqrt() → a sqrt dry-run.

sqrt()

Example

Short notes

Questions

sqrt()

Example

Short notes

Questions