Thread: Help with a problem Array

I have 2 constant integer arrays. I am computing their union, difference, and intersection. I cannot figure out why it is outputting 1 in the intersection and not in the difference. 1 Should be in the difference, not the intersection.

Further, at the end of the program I have it run Element_set for set2[0] and it returns 0, like it should, and to make sure set2[0] is 2, I have it print that as well. Yet, in my output above, it still has the same problem.

My out put should look like this:

Set1: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
Set2: 2, 4, 7, 9, 11
Union of 1&2: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11
Difference of 1&2: 1, 3, 5, 6, 8, 10
Intersection of 1&2: 2, 4, 7, 9
0 2

Any help appreciated

Code:

#include <stdio.h>

void Set_print(int Set[], int n);			/* Declares function Set_print with parameters int Set[] and int n[] */
void Set_print(int Set[], int n)
	{
		int i=n+1;				/* prints all the n values of the array Set[n] */
		for( n = 0; n < i ; n++)
		printf(" %d", Set[n]);
	}	

int Element_set(int Set[], int n, int value);		/* Declares function Element_set with parameters int Set[], int n, */
int Element_set(int Set[], int n, int value)		/* and int value 						   */
	{	
		int i;
		i=n+1;					/* Checks n-elements of Set[n] for value and if value is in Set[]  */
		 for(n=0; n<i; n++)			/* it returns 1, if value is not in Set[] it returns 0		   */
			{
				if(value == Set[n])
					return 1; 
			}
		 	if(value != Set[i-1])
				return 0;
			
	}

int  Set_union ( int Set1[], int Set2[], int Set3[], int n1, int n2 );	/* Declares function Set_union with parameters */
int  Set_union ( int Set1[], int Set2[], int Set3[], int n1, int n2 )	/* int Set1[], int Set2[], int Set3[], int n1, */
	{								/* and int n2, n1 and n2 the elements of Set1  */
		int value, set1, set2;					/* and Set2, respectively		       */
		int n3=0;
		for(value=1; value<12; value++)
		{							/* Checks Set1[n1] and Set2[n2] to see if they */
			set1 = Element_set(Set1, n1, value);		/* contain value.  If set1 or set2 contains    */
			set2 = Element_set(Set2, n2, value);		/* value, then element n3 of Set3 is set to    */
			if(set1 == 1 || set2 == 1)			/* value, and the element number of set3 is    */
				{					/* returned				       */
					Set3[n3] = value;
					n3++;
				}
		}
		return n3;
	}
			
int Set_differ ( int Set1[], int Set2[], int Set3[], int n1, int n2);	/* Declares function Set_differ with parameters */
int Set_differ ( int Set1[], int Set2[], int Set3[], int n1, int n2)	/* int Set1[], int Set2[], int Set3[], int n1,  */
	{								/* int n2, n1 and n2 the elements of Set1 and   */
		int value, set1, set2=0;					/* Set2, respectively				*/
		int n3;
		for(value=1; value<12; value++)
		{							/* Checks Set1[n1] and Set2[n2] to see if they */
			set1 = Element_set(Set1, n1, value);		/* contain value.  If set1 contains value AND  */
			set2 = Element_set(Set2, n2, value);		/* set2 does NOT contain value, then element   */
			if(set1 == 1 && set2 == 0)			/* n3 of Set3 is set to value, and the element */
				{					/* number of set3 is returned 		       */
					Set3[n3] = value;
					n3++;
				}
		}
		return n3;
	}

int Set_inter ( int Set1[], int Set2[], int Set3[], int n1, int n2);	/* Declares function Set_inter with parameters */
int Set_inter ( int Set1[], int Set2[], int Set3[], int n1, int n2)	/* int Set1[], int Set2[], int Set3[], int n1  */
	{								/* and int n2.  n1 and n2 the elements of Set1 */
		int value, set1, set2;						/* and Set2, respectively		       */
		int n3=0;
		for(value=1; value<12; value++)					/* Checks Set1[n1] and Set2[n2] to see if they */
		{							/* contain value.  If set1 AND set2 BOTH       */
			set1 = Element_set(Set1, n1, value);			/* contain value, then element n3 of set3 is   */
			set2 = Element_set(Set2, n2, value);			/* set to value, and the element number of set3*/
			if(set1 == 1 && set2 == 1 )				/* is returned.				       */
				{
					Set3[n3] = value;
					n3++;
				}
		}
		return n3;
	}

main()

 {
	int n1, n2,n3,sz3, l;
	int set1[10] = {1,2,3,4,5,6,7,8,9,10};
	int set2[5] = {2,4,7,9,11};
	int set3[11]={0};
	
	printf("\nSet1\t");	
	Set_print(set1, 9);
	printf("\n\nSet2\t");
	Set_print(set2, 4);
	
	for(n1=0, n2=0; n1<10 || n2<5; n1++, n2++)
		{
			sz3 = Set_union(set1, set2, set3, n1, n2);
		}
	printf("\n\nSet3\tUnion of 1&2\t", &Set_union);
	Set_print(set3, sz3-1);


	for(n1=0, n2=0; n1<10 || n2<5 ; n1++, n2++)
		{
			sz3 = Set_differ(set1, set2, set3, n1, n2);
		}
	printf("\n\nSet3\tDifference of 1&2\t");
	Set_print(set3, sz3-1);

	for(n1=0, n2=0; n1<10 || n2<5 ; n1++, n2++)
		{
			sz3 = Set_inter(set1, set2, set3, n1, n2);
		}
	printf("\n\nSet3\tIntersection of 1&2\t", &Set_inter);
	Set_print(set3, sz3-1);
	printf("\n");

	printf("\n%d", Element_set(set2, 4, 1));
	printf(" %d", set2[0]);
	
 }

No, I have different log-ons for different locations. That's my code, not an instructors, and its my bug I'm trying to fix.