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Golang program to find the first repeated element in the array

Here, we are going to learn how to find the first repeated element in the array in Golang (Go Language)?
Submitted by Nidhi, on March 08, 2021 [Last updated : March 03, 2023]

Finding the first repeated element in the array in Golang

Problem Solution:

In this program, we will read elements of the array from the user and then find the first repeated element in a one-dimensional array.

Program/Source Code:

The source code to find the first repeated element in the array is given below. The given program is compiled and executed successfully.

Golang code to find the first repeated element in the array

// Golang program to find the first repeated
// element in the array

package main

import "fmt"

func main() {
	var arr [6]int
	var item int = 0
	var index int = 0

	fmt.Printf("Enter array elements: \n")
	for i := 0; i <= 5; i++ {
		fmt.Printf("Elements: arr[%d]: ", i)
		fmt.Scanf("%d", &arr[i])
	}

	index = -1
	for i := 0; i < 5; i++ {
		for j := i + 1; j <= 5; j++ {
			if arr[i] == arr[j] {
				item = arr[j]
				index = j
				goto OUT
			}
		}
	}

OUT:
	if index != -1 {
		fmt.Printf("%d repeated @ %d index", item, index)
	} else {
		fmt.Printf("There is no repeated element")
	}
}

Output:

Enter array elements:
Elements: arr[0]: 12
Elements: arr[1]: 34
Elements: arr[2]: 12
Elements: arr[3]: 56
Elements: arr[4]: 12
Elements: arr[5]: 56
12 repeated @ 2 index

Explanation:

In the above program, we declare the package main. The main package is used to tell the Go language compiler that the package must be compiled and produced the executable file. Here, we imported the fmt package that includes the files of package fmt then we can use a function related to the fmt package.

In the main() function, we created an array arr and two more variables item, index.

    fmt.Printf("Enter array elements: \n")
    for i:=0;i<=4;i++{
        fmt.Printf("Elements: arr[%d]: ",i)
        fmt.Scanf("%d",&arr[i])
    }
    fmt.Printf("Enter item: ")
    fmt.Scanf("%d",&item)

In the above code, we read elements from the array user and item to be searched.

    index = -1
    for i := 0; i<5;i++{
        for j := i + 1;j<=5;j++{
                if (arr[i] == arr[j]){
                    item = arr[j]
                    index = j
                    goto OUT
                }
        }
    }

Here, we found the first repeated item in the one-dimensional array and then print the index of the repeated item on the console screen.

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