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C program to find the first repeated element in an array

mahmoud2506
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2022-05-04
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C program to find the first repeated element in an array

This program will read an integer one dimensional array and find the first repeated element. Let suppose there are 5 elements in an array 10, 20, 30, 20, 40. Here element 20 repeated at 3rd index (count starts from 0).

find first repeated element index in c

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mahmoud2506
2022-05-04
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Program to find first repeated element in C

#include <stdio.h>

int main()
{
	int arr[5];
	int i,j,n=5;
	int ind,ele; //to store index & element
	
	//read array elements
	for(i=0; i<n; i++)
	{
		printf("Enter element %d: ",i+1);
		scanf("%d",&arr[i]);
	}
	
	printf("Array elements are: ");
	for(i=0; i<n; i++)
		printf("%d ",arr[i]);
	
	printf("\n");
	ind=-1;
	//check first repeated element
	for(i=0; i<n; i++)
	{
		for(j=i+1; j<n; j++)
		{
			if(arr[i]==arr[j])
			{
				ele=arr[j];
				ind=j;
				break;
			}				
		}
		
		if(ind != -1)
			break;
	}
	if(ind!=-1)
		printf("%d repeated @ %d index\n",ele,ind);
	else
		printf("There is no repeated element\n");

	return 0;
}

Output

Firsr run:
Enter element 1: 10 
Enter element 2: 20 
Enter element 3: 30 
Enter element 4: 20 
Enter element 5: 40 
Array elements are: 10 20 30 20 40
20 repeated @ 3 index

Second run:
Enter element 1: 10 
Enter element 2: 20 
Enter element 3: 30 
Enter element 4: 40 
Enter element 5: 50 
Array elements are: 10 20 30 40 50
There is no repeated element

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total answers (1)

One Dimensional Array Programs / Examples in C programming language
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