Minus-set-operations.c

#include <stdio.h>
#include <stdlib.h>
struct Array
{
 int A[10];
 int size;
 int length;
};
void Display(struct Array arr)
{
 int i;
 printf("\nElements are\n");
 for(i=0;i<arr.length;i++)
   {

    printf("%d ",arr.A[i]);
   }
}

struct Array* Difference(struct Array *arr1,struct Array*arr2)
{
 int i,j,k;
 i=j=k=0;

 struct Array *arr3=(struct Array *)malloc(sizeof(struct Array));

 while(i<arr1->length && j<arr2->length)
 {
 if(arr1->A[i]<arr2->A[j])
   {

    arr3->A[k++]=arr1->A[i++];
   }
 else if(arr2->A[j]<arr1->A[i])
    {

    j++;
    }
 else
 {
    i++;
    j++;
 }
 }
 for(;i<arr1->length;i++)
   {

   arr3->A[k++]=arr1->A[i];
   }

 arr3->length=k;
 arr3->size=10;

 return arr3;
}
int main()
{
 struct Array arr1={{2,9,21,28,35},10,5};
 struct Array arr2={{2,3,9,18,28},10,5};
 struct Array *arr3;
 arr3=Difference(&arr1,&arr2);
 Display(*arr3);
return 0;
}