feat: lab3 complete - ENE212-0078/2023

lab3_task1.php

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+<?php
+/**
+ * ICS 2371 — Lab 3: Control Structures I
+ * Task 1: Temperature Alert System [8 marks]
+ *
+ * IMPORTANT: You must complete pseudocode AND flowchart in your PDF
+ * report BEFORE writing any code below. Marks are awarded for all
+ * three components: pseudocode, flowchart, and working code.
+ *
+ * @author     [Kevin Mutua]
+ * @student    [ENE212-0078/2023]
+ * @lab        Lab 3 of 14
+ * @unit       ICS 2371
+ * @date       [1 April 2026]
+ */
+// ══════════════════════════════════════════════════════════════
+// EXERCISE A — Temperature Alert System
+// ══════════════════════════════════════════════════════════════
+
+// Change value to test 36.8, 39.2, and 34.5
+$temperature = 39.2; 
+
+// 1. Check for Normal range (inclusive: 36.1 to 37.5)
+if ($temperature >= 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<br>";
+} else {
+    echo "$number is ODD<br>";
+}
+
+// 2. Divisibility by 3
+if ($number % 3 == 0) {
+    echo "$number is divisible by 3<br>";
+}else {
+    echo "$number is not divisible by 3<br>";
+}
+
+// 3. Divisibility by 5
+if ($number % 5 == 0) {
+    echo "$number is divisible by 5<br>";
+}else {
+    echo "$number is not divisible by 5<br>";
+}
+
+// 4. Divisibility by both
+if ($number % 3 == 0 && $number % 5 == 0) {
+    echo "$number is divisible by both 3 and 5<br>";
+}else {
+    echo "$number is not divisible by both<br>";
+}
+
+
+
+// ==========================================
+// Exercise C — Comparison Chain
+// ==========================================
+$x = 10;    // Integer
+$y = "10";  // String
+$z = 10.0;  // Float (Decimal)
+
+echo "<h3>Exercise C Results:</h3>";
+echo "<pre>"; // <pre> 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 <=> $y); // F
+
+echo "</pre>";
+
+
+// ==========================================
+// Exercise D — Null & Default Values
+// ==========================================
+echo "<h3>Exercise D Results:</h3>";
+
+// Part 1: Basic Null Coalescing
+$username = null;
+$display = $username ?? "Guest";
+echo "Welcome, $display<br>";
+
+// Part 2: Chained Null Coalescing
+$config_val = null;
+$env_val = null;
+$default = "system_default";
+$result = $config_val ?? $env_val ?? $default;
+echo "Config: $result<br>";
+
+// Part 3: My Custom Chained Example
+// This checks for a user-set theme, then a session theme, then defaults to 'Light'
+$user_theme = null;
+$session_theme = "Dark Mode"; 
+$fallback_theme = "Light Mode";
+
+$final_theme = $user_theme ?? $session_theme ?? $fallback_theme;
+
+echo "Selected Theme: $final_theme<br>";
+
+?>
+

lab3_task2.php

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+<?php
+/**
+ * ICS 2371 — Lab 3: Control Structures I
+ * Task 2: JKUAT Grade Classification System [8 marks]
+ *
+ * IMPORTANT: You must complete pseudocode AND flowchart in your PDF
+ * report BEFORE writing any code below. Marks are awarded for all
+ * three components: pseudocode, flowchart, and working code.
+ *
+ * @author     [Kevin Mutua]
+ * @student    [ENE212-0078/2023]
+ * @lab        Lab 3 of 14
+ * @unit       ICS 2371
+ * @date       [1 April 2026]
+ */
+
+/* Task 2 — Grade Classification System */
+
+// TEST DATA SETS 
+// Set A: 8, 7, 9, 6, 52
+// Set B: 9, 8, 0, 9, 55
+// Set C: 0, 0, 7, 0, 48 
+// Set D: 5, 4, 6, 3, 22
+// Set E: 0, 0, 0, 0, 15
+$cat1 = 0; $cat2 = 0; $cat3 = 0; $cat4 = 0; $exam = 15;
+
+// 1. Calculate Attendance
+$cats_attended = 0;
+if ($cat1 > 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<br>Grade: $grade ($desc)<br>Status: $supp_msg";
+
+} else {
+    // Failure to meet conditions
+    $output_message = "<strong>DISQUALIFIED — Exam conditions not met</strong><br>";
+    $output_message .= "Reason: Attended $cats_attended CATs and Exam score was $exam.";
+}
+
+// 5. Final Output (SESE Principle)
+echo "<h2>Student Result Card</h2>";
+echo $output_message;
+?>

lab3_task3.php

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+<?php
+/**
+ * ICS 2371 — Lab 3: Control Structures I
+ * Task 3: switch-case and match Expression [6 marks]
+ *
+ * @author     [Kevin Mutua]
+ * @student    [ENE212-0078/2023]
+ * @lab        Lab 3 of 14
+ * @unit       ICS 2371
+ * @date       [1 April 2026]
+ */
+
+// ==========================================
+// Exercise A — Day of Week Classifier
+// ==========================================
+$day = 3; // Change this to test 1-7
+
+echo "<h3>Exercise A: Day Classifier</h3>";
+
+switch ($day) {
+    case 1:
+        echo "Monday — Lecture day<br>";
+        break;
+    case 2:
+        echo "Tuesday — Lecture day<br>";
+        break;
+    case 3:
+        echo "Wednesday — Lecture day<br>";
+        break;
+    case 4:
+        echo "Thursday — Lecture day<br>";
+        break;
+    case 5:
+        echo "Friday — Lecture day<br>";
+        break;
+    case 6:
+    case 7:
+        echo "Weekend<br>";
+        break;
+    default:
+        echo "Invalid day<br>";
+}
+
+echo "<hr>";
+
+// ==========================================
+// Exercise B — HTTP Status Code Explainer
+// ==========================================
+$status_code = 404;
+
+echo "<h3>Exercise B: HTTP Explainer (Switch)</h3>";
+
+switch ($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 "<hr>";
+
+// ==========================================
+// Exercise C — PHP 8 match Rewrite
+// ==========================================
+echo "<h3>Exercise C: HTTP Explainer (Match)</h3>";
+
+// 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;
+?>

lab3_task4.php

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+<?php
+/**
+ * ICS 2371 — Lab 3: Control Structures I
+ * Task 4: Nested Conditions — Loan Eligibility Checker [6 marks]
+ *
+ * IMPORTANT: You must complete pseudocode AND flowchart in your PDF
+ * report BEFORE writing any code below.
+ *
+ * @author     [Kevin Mutua]
+ * @student    [ENE212-0078/2023]
+ * @lab        Lab 3 of 14
+ * @unit       ICS 2371
+ * @date       [1 April 2026]
+ */
+
+/* Task 4 — HELB Loan Eligibility Checker */
+
+// TEST DATA SETS (Update these to test A, B, C, D, and E)
+$enrolled = true;
+$gpa = 2.0;
+$annual_income = 50000;
+$previous_loan = true;
+
+$final_status = "";
+
+// 1. OUTER CHECK — Enrollment
+if ($enrolled === true) {
+
+    // 2. INNER CHECK 1 — GPA
+    if ($gpa >= 2.0) {
+
+        // 3. INNER CHECK 2 — Income
+        if ($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 "<h2>HELB Eligibility Result</h2>";
+echo "Status: " . $final_status;
+?>