Create 5_FibonacciSequenceGenerator

Example/5_FibonacciSequenceGenerator

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+/*
+ * Project 5: Fibonacci Sequence Generator
+ * Author: Bocaletto Luca
+ * Date: 2025-06-22
+ * GitHub: bocaletto-luca
+ *
+ * Description:
+ * This program generates the Fibonacci sequence up to a user-specified number
+ * of terms. The Fibonacci sequence starts with 0 and 1, and each subsequent
+ * term is the sum of the two preceding ones.
+ *
+ * Key Concepts:
+ * - Using loops (for loop) to generate sequences.
+ * - Basic arithmetic operations for computing Fibonacci numbers.
+ * - Input validation to ensure a positive number of terms.
+ */
+
+#include <stdio.h>
+
+int main(void) {
+    int numTerms;            // Variable to store the number of terms for Fibonacci sequence
+
+    // Prompt the user to enter how many Fibonacci terms to generate.
+    printf("Enter the number of Fibonacci terms to generate: ");
+    scanf("%d", &numTerms);
+
+    // Validate that the user entered a positive number.
+    if (numTerms <= 0) {
+        printf("Error: Please enter a positive integer.\n");
+        return 1;  // Return non-zero value to indicate an error.
+    }
+
+    // Special case: if only one term is requested.
+    if (numTerms == 1) {
+        printf("Fibonacci sequence with 1 term:\n0\n");
+        return 0;
+    }
+
+    // Initialize the first two Fibonacci numbers.
+    // Using the 'long long' data type to accommodate larger numbers.
+    long long previous = 0;  // The first term of the sequence.
+    long long current = 1;   // The second term of the sequence.
+
+    // Display the initial part of the sequence.
+    printf("Fibonacci sequence with %d terms:\n", numTerms);
+    printf("%lld, %lld", previous, current);
+
+    // Generate the remaining Fibonacci terms up to the specified number.
+    for (int i = 3; i <= numTerms; ++i) {
+        long long next = previous + current;  // Calculate the next term.
+        printf(", %lld", next);                // Output the next term.
+        previous = current;                     // Update 'previous' to the current term.
+        current = next;                         // Update 'current' to the newly calculated term.
+    }
+
+    // End the output with a newline for clean formatting.
+    printf("\n");
+
+    // Return 0 to indicate successful execution of the program.
+    return 0;
+}