C Program to Delete Duplicate Elements from an Array

C Program to Delete Duplicate Elements from an Array

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

Programs to Delete Duplicate Elements from an Array in C

  • C Program to Delete Duplicate Elements from an Array using Standard Method
  • C Program to Delete Duplicate Elements from an Array using Function

C Program to Delete Duplicate Elements from an Array using Standard Method

#include <stdio.h>
 
int main()
{
    int a[10000],i,j,n,k=0,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;
		       }
	       }
 		}
        if(a[i]!=-1)
        {
        	 a[k++]=a[i];
 
		} 
   
          
    }
       
    printf("elements after deleting duplicates in array :\n");
 
     
    for(i=0; i<n-c; i++)
    {
        
		printf("%d ",a[i]);
 
         
    }    
    return 0;
} 

The output of the above c program; as follows:

Enter size of the array : 8
Enter elements in array : 1 1 2 2 3 3 4 4
elements after deleting duplicates in array :
1 2 3 4 

C Program to Delete Duplicate Elements from an Array using Function

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

The output of the above c program; as follows:

Enter size of the array : 5
Enter elements in array : 1 1 2 3 4
elements after deleting duplicates in array :
1  2  3  4  

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AuthorAdmin

My name is Devendra Dode. I am a full-stack developer, entrepreneur, and owner of Tutsmake.com. I like writing tutorials and tips that can help other developers. I share tutorials of 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 from a starting stage. As well as demo example.

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