Remove Duplicate Numbers From An Array in C

 Machine Problem

Write a C program to remove all duplicate numbers from an array.      It will only display unique numbers on screen after the deletion of all duplicate numbers from an array.

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Program Listing
#include <stdio.h>
  
 /* 
    Machine Problem
    Write a C program to remove all duplicate numbers from an array.
    It will only display unique numbers on screen after the deletion 
	of all duplicate numbers from an array.
	*/
    
int main() {
   int arr[100], i=0;
   int j=0, k=0,items=0;
 
   printf("\n");
   printf("\tRemove Duplicate Numbers From An Array in C");
   printf("\n\n");
   printf("\tHow Many Items? : ");
   scanf("%d",&items);
 
   printf("\n");
   for (i = 0; i < items; i++) {
   	    printf("\tEnter Value in Item No. % : ",i+1);
		scanf("%d", &arr[i]);
   }
     
   printf("\n");
   printf("\tList of Numbers That Are Not Duplicate ");
   printf("\n\n");
   for (i = 0; i < items; i++) {
      for (j = i + 1; j < items;) {
         if (arr[j] == arr[i]) {
            for (k = j; k < items; k++) {
               arr[k] = arr[k + 1];
            }
            items--;
         } else
            j++;
      }
   }
   printf("\n");
   printf("\t");
   for (i = 0; i < items; i++) {
      printf("%d ", arr[i]);
   }
    printf("\n\n");
   printf("\tEnd of Program");
   printf("\n");
   return 0;
}