C Program to find the two sets Intersection and Union

Write a C Program to find the two sets Intersection and Union
A Set is a collection of well defined and distinct objects.
Intersection of two sets A and B is defined as, all the elements of set A, which are also elements of set B.Union of two sets A and B is defined as, all the elements of A and B, but not belonged to both.
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#include<stdio.h>
#include<conio.h>
void Union(int set1[10],int set2[10],int m,int n);
void Intersection(int set1[10],int set2[10],int m,int n);
void main()
{
int a[10],b[10],m,n,i,j;
int ch;
clrscr();
printf("nEnter the number of elements in first set:n");
scanf("%d",&m);
printf("nEnter the elements:n");
for(i=0;i<m;i++)
{
scanf("%d",&a[i]);
}
printf("nElement of First set:nn");
for(i=0;i<m;i++)
{
printf("%dt",a[i]);
}
printf("nEnter the number of elements in second set:n");
scanf("%d",&n);
printf("nEnter the elements:n");
for(i=0;i<n;i++)
{
scanf("%d",&b[i]);
}
printf("nElement of second setn");
for(i=0;i<n;i++)
{
printf("%dt",b[i]);
}
for(;;)
{
printf("nnMenunn1.Unionn2.Intersection");
printf("n3.exit");
printf("nEnter your choice:n");
scanf("%d",&ch);
switch(ch) {
case 1:
Union(a,b,m,n);
break;
case 2:
Intersection(a,b,m,n);
break;
case 3:
exit(0);
}
getch();
}
}

void Union(int a[10],int b[10],int m,int n)
{
int c[20],i,j,k=0,flag=0;
for(i=0;i<m;i++)
{
c[k]=a[i];
k++;
}
for(i=0;i<n;i++)
{
flag=0;
for(j=0;j<m;j++)
{
if(b[i]==c[j])
{
flag=1;
break;
}
}
if(flag==0)
{
c[k]=b[i];
k++;
}
}
printf("nElement of resultant setnn");
for(i=0;i<k;i++)
{
printf("t%d",c[i]);
}
}
void Intersection(int a[10],int b[10],int m,int n)
{
int c[20],i,j,k=0,flag=0;
for(i=0;i<m;i++)
{
flag=0;
for(j=0;j<n;j++)
{
if(a[i]==b[j])
{
flag=1;
break;
}
}
if(flag==1)
{
c[k]=a[i];
k++;
}
}
if(k==0)
{
printf("nnResultant set is null set!n");
}else{
printf("nElement of resultant setn");
for(i=0;i<k;i++)
{
printf("t%d",c[i]);
}
}
}


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