February 6, 2022, Learn eTutorial

1392

For a better understanding of this example, we always recommend you to learn the basic topics of Golang programming listed below:

The Fibonacci sequence of a number is an integer numbers sequence where series starting from 0, 1 and every number after the first two is the sum of the two preceding ones. To understand more details, let us see the below example.

The Fibonacci sequence of 4 is 0 1 1 2 3

Here we are explaining how to write a GO program to find the Fibonacci sequence. We can display data on the screen by using the built-in function `fmt.println()`

and read data by using `fmt.scanln()`

. These functions are defined under the **fmt** package and it helps to write standard output. In order to read and display standard input and output, we need to import the **fmt** package before starting the main function.

The logic we applied in this GO program is to declare the variable **num**, Then read the number, which you want to find the Fibonacci sequence, from the user and save it into the variable **num**. Define a function `fibonacciSeries(num)`

to calculate the Fibonacci series of numbers. Here the function accepts the input integer number **num**.

In this function, it will take two initial numbers for the series, i.e., 0 and 1. Print first two terms of series like 0 and 1 respectively. Use a true for loop and declare a third variable to store the previous two values. Then print the summation of two numbers until the summation is lesser than the given number **num**.

Given below are the steps which are used in the GO program to print Fibonacci Sequence

STEP 1: Import the package **fmt**

STEP 2: Open the **main()** to start the program, GO program execution starts with the **main()**

STEP 3: Declare the variables **num**.

STEP 4: Read the input number **num** which you want to find Fibonacci Sequence.

STEP 5: Call the function `Fibonacci(num)`

STEP6: Display the Fibonacci sequence of the number on the output screen.

STEP 7: Exit

STEP 1: Define a function that accepts the input integer numbers

STEP 2: Set the two initial numbers for the series, i.e., 0 and 1 into variables **x** and **y** respectively.

STEP 3: Assign third variable `z=y`

STEP 4: Print first two terms of series i.e.,** x **and** y**

STEP 5: Use **for** loop and print the summation of two numbers until the summation is lesser than the given **num**. That means the loop will do the following steps

- Assign
`z=y`

- Calculate
`y = x + y`

- If
`y >= num`

then nothing to print and go to step 6. Otherwise, assign`x=z`

and print value of**y**

STEP 6: Exit

` ````
package main
import "fmt"
func fibonacciSeries(num int){
// var z int
x := 0
y := 1
z := y
fmt.Printf("Fibonacci Series is: %d %d", x, y)
for true{
z = y
y = x + y
if y >= num{
fmt.Println()
break
}
x = z
fmt.Printf(" %d", y)
}
}
```

Enter the number 4 Fibonacci Series is: 0 1 1 2 3