checkDuplicate.c

// C Program for 
// checking duplicate 
// values in a array 
#include <stdio.h> 

int Sort(int arr[], int size) 
{ 
	for (int i = 0; i < size - 1; i++) { 

		for (int j = 0; j < size - i - 1; j++) { 
			if (arr[j] > arr[j + 1]) { 
				int temp = arr[j]; 
				arr[j] = arr[j + 1]; 
				arr[j + 1] = temp; 
			} 
		} 
	} 
} 

// find repeating element 
void findRepeating(int arr[], int n) 
{ 
	int count = 0; 
	for (int i = 0; i < n; i++) { 

		int flag = 0; 
		while (i < n - 1 && arr[i] == arr[i + 1]) { 
			flag = 1; 
			i++; 
		} 
		if (flag) 
			printf("%d ", (arr[i - 1])); 
	} 

	return; 
} 

int main() 
{ 
	int arr[] = { 1, 3, 4, 1, 2, 3, 5, 5 }; 

	int n = sizeof(arr) / sizeof(arr[0]); 
	
	Sort(arr,n); 
	
	findRepeating(arr,n); 
	
	

	return 0; 
}