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fibonacchi-go.go

@@ -1,22 +1,54 @@
 package main
 
 import (
+	"flag"
 	"fmt"
+	"os"
 )
 
-// Recursive function for calculating the n-th Fibonacci number
-func fibonacci(n int) int {
-	if n <= 1 {
-		return n
+// A function for calculating Fibonacci numbers from 0 to n
+func fibonacciSequence(n int) []int {
+	sequence := make([]int, n+1)
+	if n >= 0 {
+		sequence[0] = 0
 	}
-	return fibonacci(n-1) + fibonacci(n-2)
+	if n >= 1 {
+		sequence[1] = 1
+	}
+	for i := 2; i <= n; i++ {
+		sequence[i] = sequence[i-1] + sequence[i-2]
+	}
+	return sequence
 }
 
 func main() {
 	var n int
-	fmt.Print("Enter the number of the Fibonacci number: ")
-	fmt.Scanln(&n)
+	var outputFileName string
+
+	// Defining flags
+	flag.IntVar(&n, "n", 10, "The number up to which to calculate the Fibonacci sequence")
+	flag.StringVar(&outputFileName, "o", "output.txt", "The name of the output file to record the result")
+	flag.Parse()
+
+	// Calculating the sequence
+	sequence := fibonacciSequence(n)
+
+	// Opening the file for recording
+	file, err := os.Create(outputFileName)
+	if err != nil {
+		fmt.Println("Error creating the file:", err)
+		return
+	}
+	defer file.Close()
+
+	// Writing the sequence to a file
+	for i, num := range sequence {
+		_, err := file.WriteString(fmt.Sprintf("Fibonacci(%d) = %d\n", i, num))
+		if err != nil {
+			fmt.Println("Error writing to the file:", err)
+			return
+		}
+	}
 
-	result := fibonacci(n)
-	fmt.Printf("Fibonacci(%d) = %d\n", n, result)
+	fmt.Printf("Fibonacci numbers up to %d are written to the %s\n file", n, outputFileName)
 }