C Program Count Number of Duplicate Elements in An Array

C Program Count Number of Duplicate Elements in An Array

C program to count number of duplicate elements in an array; Through this tutorial, we will learn how to count the number of duplicate elements in an array using standard method and function in c programs.

Programs Count Number of Duplicate Elements in An Array in C

  • C Program Count Number of Duplicate Elements in An Array using Standard Method
  • C Program Count Number of Duplicate Elements in An Array using Function

C Program Count Number of Duplicate Elements in An Array using Standard Method

#include <stdio.h>

int main()
{
    int a[10000],b[10000],i,j,n,c=0 ;
   
    printf("Enter size of the array : ");
    scanf("%d", &n);
 
    printf("Enter elements in array : ");
    for(i=0; i<n; i++)
    {
        scanf("%d",&a[i]);
    }
    
  for(i=0; i<n; i++)
    {
         if(a[i]!=-1)
		{
		    for(j=i+1; j<n; j++)
     
            {
        	   if(a[i]==a[j])
        	    {
			       c++;
			       a[j]=-1;
		       }
	       }
 		}
         
   
          
    }
     
            printf("duplicate numbers in the  array: %d",c);
 
         
      
    return 0;
}

The output of the above c program; as follows:

Enter size of the array : 5
Enter elements in array : 1 2 5 4 4
duplicate numbers in the  array: 1

C Program Count Number of Duplicate Elements in An Array using Function

#include <stdio.h>
 
count(int *a,int n)
{ 
    int i,c=0,j;
    for(i=0; i<n; i++)
    {
         if(a[i]!=-1)
		{
		    for(j=i+1; j<n; j++)
     
            {
        	   if(a[i]==a[j])
        	    {
			       c++;
			       a[j]=-1;
		        }
	       }
 		}
         
   
          
    }
    return c;
     
 }
 
 
int main()
{
    int a[10000],b[10000],i,n,c;
   
    printf("Enter size of the array : ");
    scanf("%d", &n);
 
    printf("Enter elements in array : ");
    for(i=0; i<n; i++)
    {
        scanf("%d",&a[i]);
    }
    
    c=count(a,n);
    
	printf("duplicate numbers in the  array: %d",c);
 
     
	return 0;
}

The output of the above c program; as follows:

Enter size of the array : 5
Enter elements in array : 11 11 22 22 33
duplicate numbers in the  array: 2

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AuthorAdmin

Greetings, I'm Devendra Dode, a full-stack developer, entrepreneur, and the proud owner of Tutsmake.com. My passion lies in crafting informative tutorials and offering valuable tips to assist fellow developers on their coding journey. Within my content, I cover a spectrum of technologies, including PHP, Python, JavaScript, jQuery, Laravel, Livewire, CodeIgniter, Node.js, Express.js, Vue.js, Angular.js, React.js, MySQL, MongoDB, REST APIs, Windows, XAMPP, Linux, Ubuntu, Amazon AWS, Composer, SEO, WordPress, SSL, and Bootstrap. Whether you're starting out or looking for advanced examples, I provide step-by-step guides and practical demonstrations to make your learning experience seamless. Let's explore the diverse realms of coding together.

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