C program to perform Intersection operation on sets

Intersection of Sets:- If two sets A and B are given, then the intersection of A and B is the subset of universal set U, which consist of elements common to both A and B. It is denoted by the symbol ‘∩’.
Example:- Let A = {1,2,3} and B = {3,4,5} Then, A∩B = {3}; because 3 is common to both the sets.

 // write a program in c to create two set and 
 // perform the Intersection Operation on sets
 #include<stdio.h>
 #include<conio.h>
 int main()
 {
    int a[20], b[20],c[20],i,j,k=0,n1,n2;

    // taking input for first set A
    printf("Enter the size of set A:-\n");
    scanf("%d", &n1);
    printf("Enter the elements of set A:-\n");
    for(i=0; i<n1; i++)
    {
        scanf("%d", &a[i]);
    }

    //taking input for second set B
    printf("Enter the size of set B:-\n");
    scanf("%d", &n2);
    printf("Enter the elements of set B:-\n");
    for(i=0; i<n2;i++)
    {
        scanf("%d", &b[i]);
    }


    printf("\n set A is :-\n");
    for(i=0; i<n1;i++)
    {
        printf("%d ", a[i]);
    }
    printf("\n set B is :-\n");
    for(i=0; i<n2;i++)
    {
        printf("%d ", b[i]);
    }
    // Logic for Intersection of set A and set B
    for(i=0; i<n1; i++)
    {
        for (j=0; j<n2; j++)
        {
            if(a[i]==b[j])
            {
                c[k]=a[i];
                k++;
            }
        }
    }
    //printing the Insertion of set A and set B 
    printf("\n Insertion of set A and set B is :-\n");
    for(i=0; i<k; i++)
    {
        printf("%d ", c[i]);
    }
    getch();
  }

When the above program is executed, it produces following results --

  Enter the size of set A:-
  4
  Enter the element of setA:-
  12
  35
  9
  51
  Enter the size of set B:-
  5
  Enter the element of set B:-
  12
  76
  35
  77
  9
  
   set A is :-
  12 35 9 51 
   set B is :-
  12 76 35 77 9 
   Insertion of set A and set B is :-
  12 35 9