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]);
}
