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3 | 3 | * ICS 2371 — Lab 3: Control Structures I |
4 | 4 | * Task 1: Simple if and if-else — Warm-Up Exercises [5 marks] |
5 | 5 | * |
6 | | - * @author [Your Full Name] |
7 | | - * @student [Your Reg Number, e.g. SCT212-XXXX/2024] |
| 6 | + * @author [Joshua Mativo] |
| 7 | + * @student [ENE212-0071/2023] |
8 | 8 | * @lab Lab 3 of 14 |
9 | 9 | * @unit ICS 2371 |
10 | | - * @date [Date completed] |
| 10 | + * @date [2/4/2026] |
11 | 11 | */ |
12 | 12 |
|
| 13 | +echo "<h2>Task 1 — Warm-Up Exercises</h2>"; |
| 14 | +echo "<hr>"; |
| 15 | + |
13 | 16 | // ══════════════════════════════════════════════════════════════ |
14 | 17 | // EXERCISE A — Temperature Alert System |
15 | 18 | // ══════════════════════════════════════════════════════════════ |
16 | | -// Declare $temperature = 39.2 |
17 | | -// Use separate if statements (not if-else) to print: |
18 | | -// "Normal" if temp is between 36.1 and 37.5 inclusive |
19 | | -// "Fever" if temp > 37.5 |
20 | | -// "Hypothermia Warning" if temp < 36.1 |
21 | | -// Test with: 36.8, 39.2, 34.5 — screenshot each |
| 19 | +echo "<h3>Exercise A — Temperature Alert System</h3>"; |
| 20 | + |
| 21 | +$temperature = 34.5; // change to 36.8 and 34.5 for other test screenshots |
22 | 22 |
|
23 | | -// TODO: Exercise A — your code here |
| 23 | +echo "Temperature: {$temperature}°C → "; |
24 | 24 |
|
| 25 | +if ($temperature >= 36.1 && $temperature <= 37.5) { |
| 26 | + echo "<strong>Normal</strong>"; |
| 27 | +} |
| 28 | +if ($temperature > 37.5) { |
| 29 | + echo "<strong style='color:red;'>Fever</strong>"; |
| 30 | +} |
| 31 | +if ($temperature < 36.1) { |
| 32 | + echo "<strong style='color:blue;'>Hypothermia Warning</strong>"; |
| 33 | +} |
| 34 | +echo "<br>"; |
25 | 35 |
|
26 | 36 | // ══════════════════════════════════════════════════════════════ |
27 | 37 | // EXERCISE B — Even or Odd |
28 | 38 | // ══════════════════════════════════════════════════════════════ |
29 | | -// Declare $number = 47 |
30 | | -// Use if-else to print "$number is EVEN" or "$number is ODD" |
31 | | -// Also check divisibility by 3, by 5, and by both 3 and 5 — one line each |
| 39 | +echo "<h3>Exercise B — Even or Odd</h3>"; |
| 40 | + |
| 41 | +$number = 47; |
32 | 42 |
|
33 | | -// TODO: Exercise B — your code here |
| 43 | +if ($number % 2 === 0) { |
| 44 | + echo "$number is <strong>EVEN</strong><br>"; |
| 45 | +} else { |
| 46 | + echo "$number is <strong>ODD</strong><br>"; |
| 47 | +} |
34 | 48 |
|
| 49 | +// Divisibility checks |
| 50 | +if ($number % 3 === 0) { |
| 51 | + echo "$number is divisible by 3<br>"; |
| 52 | +} else { |
| 53 | + echo "$number is NOT divisible by 3<br>"; |
| 54 | +} |
| 55 | + |
| 56 | +if ($number % 5 === 0) { |
| 57 | + echo "$number is divisible by 5<br>"; |
| 58 | +} else { |
| 59 | + echo "$number is NOT divisible by 5<br>"; |
| 60 | +} |
| 61 | + |
| 62 | +if ($number % 3 === 0 && $number % 5 === 0) { |
| 63 | + echo "$number is divisible by both 3 and 5<br>"; |
| 64 | +} else { |
| 65 | + echo "$number is NOT divisible by both 3 and 5<br>"; |
| 66 | +} |
35 | 67 |
|
36 | 68 | // ══════════════════════════════════════════════════════════════ |
37 | 69 | // EXERCISE C — Comparison Chain |
38 | 70 | // ══════════════════════════════════════════════════════════════ |
39 | | -// Run this code EXACTLY as written. |
40 | | -// Record all six outputs in your report and explain each result. |
| 71 | +echo "<h3>Exercise C — Comparison Chain</h3>"; |
| 72 | +echo "<pre>"; |
41 | 73 |
|
42 | 74 | $x = 10; $y = "10"; $z = 10.0; |
43 | 75 |
|
44 | | -var_dump($x == $y); // A: ? |
45 | | -var_dump($x === $y); // B: ? |
46 | | -var_dump($x == $z); // C: ? |
47 | | -var_dump($x === $z); // D: ? |
48 | | -var_dump($y === $z); // E: ? |
49 | | -var_dump($x <=> $y); // F: spaceship — what type? what value? |
| 76 | +echo "x = 10 (int), y = \"10\" (string), z = 10.0 (float)\n\n"; |
50 | 77 |
|
51 | | -// Your explanation of each result goes in your PDF report (not here). |
| 78 | +echo "A: var_dump(\$x == \$y) → "; var_dump($x == $y); // bool(true) |
| 79 | +echo "B: var_dump(\$x === \$y) → "; var_dump($x === $y); // bool(false) |
| 80 | +echo "C: var_dump(\$x == \$z) → "; var_dump($x == $z); // bool(true) |
| 81 | +echo "D: var_dump(\$x === \$z) → "; var_dump($x === $z); // bool(false) |
| 82 | +echo "E: var_dump(\$y === \$z) → "; var_dump($y === $z); // bool(false) |
| 83 | +echo "F: var_dump(\$x <=> \$y) → "; var_dump($x <=> $y); // int(0) |
52 | 84 |
|
| 85 | +echo "</pre>"; |
53 | 86 |
|
54 | 87 | // ══════════════════════════════════════════════════════════════ |
55 | 88 | // EXERCISE D — Null & Default Values |
56 | 89 | // ══════════════════════════════════════════════════════════════ |
57 | | -// Run this code as written, then extend it as instructed below. |
| 90 | +echo "<h3>Exercise D — Null Coalescing Operator (??)</h3>"; |
58 | 91 |
|
59 | 92 | $username = null; |
60 | 93 | $display = $username ?? "Guest"; |
|
68 | 101 | echo "Config: $result<br>"; |
69 | 102 |
|
70 | 103 | // TODO: Add one more chained ?? example of your own and explain it in your report. |
| 104 | +// Custom example — simulating a user profile with fallback display name |
| 105 | +$db_name = null; // not found in database |
| 106 | +$session_name = null; // not set in session |
| 107 | +$cookie_name = "Alice"; // found in cookie |
| 108 | +$fallback = "Anonymous"; |
| 109 | + |
| 110 | +$display_name = $db_name ?? $session_name ?? $cookie_name ?? $fallback; |
| 111 | +echo "Display name (db → session → cookie → fallback): <strong>$display_name</strong><br>"; |
| 112 | +echo "<small>Explanation: \$db_name and \$session_name are null, so PHP falls through to \$cookie_name = 'Alice'.</small><br>"; |
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