From 573597f0b90bfc05551a0930f72e280caaa32046 Mon Sep 17 00:00:00 2001 From: Kevin Mutua - ENE212-0078/2023 Date: Fri, 3 Apr 2026 11:46:45 +0300 Subject: [PATCH] lab 3 code listings --- lab3_task1.php | 123 +++++++++++++++++++++++++++++++++++++++++++++++++ lab3_task2.php | 78 +++++++++++++++++++++++++++++++ lab3_task3.php | 84 +++++++++++++++++++++++++++++++++ lab3_task4.php | 63 +++++++++++++++++++++++++ 4 files changed, 348 insertions(+) create mode 100644 lab3_task1.php create mode 100644 lab3_task2.php create mode 100644 lab3_task3.php create mode 100644 lab3_task4.php diff --git a/lab3_task1.php b/lab3_task1.php new file mode 100644 index 0000000..b207d70 --- /dev/null +++ b/lab3_task1.php @@ -0,0 +1,123 @@ += 36.1 && $temperature <= 37.5) { + echo "Normal"; +} + +// 2. Check for Fever +if ($temperature > 37.5) { + echo "Fever"; +} + +// 3. Check for Hypothermia Warning +if ($temperature < 36.1) { + echo "Hypothermia Warning"; +} + + +// ══════════════════════════════════════════════════════════════ +// EXERCISE B — Even or Odd +// ══════════════════════════════════════════════════════════════ + +$number = 47; + +// 1. Even or Odd Check +if ($number % 2 == 0) { + echo "$number is EVEN
"; +} else { + echo "$number is ODD
"; +} + +// 2. Divisibility by 3 +if ($number % 3 == 0) { + echo "$number is divisible by 3
"; +}else { + echo "$number is not divisible by 3
"; +} + +// 3. Divisibility by 5 +if ($number % 5 == 0) { + echo "$number is divisible by 5
"; +}else { + echo "$number is not divisible by 5
"; +} + +// 4. Divisibility by both +if ($number % 3 == 0 && $number % 5 == 0) { + echo "$number is divisible by both 3 and 5
"; +}else { + echo "$number is not divisible by both
"; +} + + + +// ========================================== +// Exercise C — Comparison Chain +// ========================================== +$x = 10; // Integer +$y = "10"; // String +$z = 10.0; // Float (Decimal) + +echo "

Exercise C Results:

"; +echo "
"; // 
 makes var_dump output easier to read in a browser
+
+var_dump($x == $y);  // A
+var_dump($x === $y); // B
+var_dump($x == $z);  // C
+var_dump($x === $z); // D
+var_dump($y === $z); // E
+var_dump($x <=> $y); // F
+
+echo "
";
+
+
+// ==========================================
+// Exercise D — Null & Default Values
+// ==========================================
+echo "
Exercise D Results:
";
+
+// Part 1: Basic Null Coalescing
+$username = null;
+$display = $username ?? "Guest";
+echo "Welcome, $display
";
+
+// Part 2: Chained Null Coalescing
+$config_val = null;
+$env_val = null;
+$default = "system_default";
+$result = $config_val ?? $env_val ?? $default;
+echo "Config: $result
";
+
+// Part 3: My Custom Chained Example
+// This checks for a user-set theme, then a session theme, then defaults to 'Light'
+$user_theme = null;
+$session_theme = "Dark Mode"; 
+$fallback_theme = "Light Mode";
+
+$final_theme = $user_theme ?? $session_theme ?? $fallback_theme;
+
+echo "Selected Theme: $final_theme
";
+
+?>
+
diff --git a/lab3_task2.php b/lab3_task2.php
new file mode 100644
index 0000000..bd8471d
--- /dev/null
+++ b/lab3_task2.php
@@ -0,0 +1,78 @@
+ 0) $cats_attended++;
+if ($cat2 > 0) $cats_attended++;
+if ($cat3 > 0) $cats_attended++;
+if ($cat4 > 0) $cats_attended++;
+
+$total = $cat1 + $cat2 + $cat3 + $cat4 + $exam;
+$output_message = "";
+
+// 2. Eligibility Rule (Nested IF)
+if ($cats_attended >= 3 && $exam >= 20) {
+    
+    // 3. Grading Rules (if-elseif-else, highest first)
+    if ($total >= 70) {
+        $grade = "A";
+        $desc  = "Distinction";
+    } elseif ($total >= 65) {
+        $grade = "B+";
+        $desc  = "Credit Upper";
+    } elseif ($total >= 60) {
+        $grade = "B";
+        $desc  = "Credit Lower";
+    } elseif ($total >= 55) {
+        $grade = "C+";
+        $desc  = "Pass Upper";
+    } elseif ($total >= 50) {
+        $grade = "C";
+        $desc  = "Pass Lower";
+    } elseif ($total >= 40) {
+        $grade = "D";
+        $desc  = "Marginal Pass";
+    } else {
+        $grade = "E";
+        $desc  = "Fail";
+    }
+
+    // 4. Supplementary Rule (Ternary)
+    $supp_msg = ($grade == "D") ? "Eligible for Supplementary Exam" : "Not eligible for supplementary";
+
+    $output_message = "Total Score: $total
Grade: $grade ($desc)
Status: $supp_msg";
+
+} else {
+    // Failure to meet conditions
+    $output_message = "DISQUALIFIED — Exam conditions not met
";
+    $output_message .= "Reason: Attended $cats_attended CATs and Exam score was $exam.";
+}
+
+// 5. Final Output (SESE Principle)
+echo "
Student Result Card
";
+echo $output_message;
+?>
\ No newline at end of file
diff --git a/lab3_task3.php b/lab3_task3.php
new file mode 100644
index 0000000..3feb5ab
--- /dev/null
+++ b/lab3_task3.php
@@ -0,0 +1,84 @@
+Exercise A: Day Classifier";
+
+switch ($day) {
+    case 1:
+        echo "Monday — Lecture day
";
+        break;
+    case 2:
+        echo "Tuesday — Lecture day
";
+        break;
+    case 3:
+        echo "Wednesday — Lecture day
";
+        break;
+    case 4:
+        echo "Thursday — Lecture day
";
+        break;
+    case 5:
+        echo "Friday — Lecture day
";
+        break;
+    case 6:
+    case 7:
+        echo "Weekend
";
+        break;
+    default:
+        echo "Invalid day
";
+}
+
+echo "
";
+
+// ==========================================
+// Exercise B — HTTP Status Code Explainer
+// ==========================================
+$status_code = 404;
+
+echo "
Exercise B: HTTP Explainer (Switch)
";
+
+switch ($status_code) {
+    case 200: echo "200: OK"; break;
+    case 301: echo "301: Moved Permanently"; break;
+    case 400: echo "400: Bad Request"; break;
+    case 401: echo "401: Unauthorized"; break;
+    case 403: echo "403: Forbidden"; break;
+    case 404: echo "404: Not Found"; break;
+    case 500: echo "500: Internal Server Error"; break;
+    default:  echo "Unknown Status Code"; break;
+}
+
+echo "
";
+
+// ==========================================
+// Exercise C — PHP 8 match Rewrite
+// ==========================================
+echo "
Exercise C: HTTP Explainer (Match)
";
+
+// match is an expression, so we can assign its result to a variable
+$explanation = match ($status_code) {
+    200 => "200: OK",
+    301 => "301: Moved Permanently",
+    400 => "400: Bad Request",
+    401 => "401: Unauthorized",
+    403 => "403: Forbidden",
+    404 => "404: Not Found",
+    500 => "500: Internal Server Error",
+    default => "Unknown Status Code",
+};
+
+echo $explanation;
+?>
\ No newline at end of file
diff --git a/lab3_task4.php b/lab3_task4.php
new file mode 100644
index 0000000..eab0ab0
--- /dev/null
+++ b/lab3_task4.php
@@ -0,0 +1,63 @@
+= 2.0) {
+
+        // 3. INNER CHECK 2 — Income
+        if ($annual_income < 100000) {
+            $loan_amount = "Full loan";
+        } elseif ($annual_income < 250000) {
+            $loan_amount = "Partial 75%";
+        } elseif ($annual_income < 500000) {
+            $loan_amount = "Partial 50%";
+        } else {
+            $loan_amount = "Not eligible — Income above limit";
+        }
+
+        // 4. TERNARY — Renewal vs New (only if eligible for some loan)
+        // We check if the word "Not" is in the loan_amount string
+        if (strpos($loan_amount, "Not") === false) {
+            $app_type = ($previous_loan) ? "Renewal application" : "New application";
+            $final_status = "$loan_amount | $app_type";
+        } else {
+            $final_status = $loan_amount;
+        }
+
+    } else {
+        $final_status = "Not eligible — GPA below minimum";
+    }
+
+} else {
+    $final_status = "Not eligible — must be an active student";
+}
+
+// 5. Output (SESE Principle)
+echo "
HELB Eligibility Result
";
+echo "Status: " . $final_status;
+?>
\ No newline at end of file