Need help on making an array in a loop

here's my code

Code:

#include<stdio.h>
int main()
{
    int setA[1000],setB[1000],a,b,n=1,m=1,i1,i2;   
    printf("Enter size of set A: ");
    scanf("%d",&a);   
    for (i1=0;i1<a;i1++)
    {
        printf("Enter A%d: ",n);
        scanf("%d",&setA[i1]);
        n++;
    }
    printf("Enter size of set B: ");
    scanf("%d",&b);
    for (i2=0;i2<b;i2++)
    {
        printf("Enter B%d: ",m);
        scanf("%d",&setB[i2]);
        m++;
    }
    printf("\n{");
    for(i1=0;i1<a;i1++)
    {
        if (i1 != a-1)
        printf("%d,",setA[i1]);
        else if (i1 == a-1)
        printf("%d",setA[i1]);
    }
    printf("} x {");
    for(i2=0;i2<b;i2++)
    {
        if (i2 != b-1)
        printf("%d,",setB[i2]);
        else if (i2 == b-1)
        printf("%d",setB[i2]);
    }
    printf("} = {");
    for(i1=0;i1<a;i1++)
    {
        for(i2=0;i2<b;i2++)
        {
            if ((i1 != a-1)||(i2 != b-1))
            {
                printf("(%d,%d),",setA[i1],setB[i2]);
            }
            else if ((i1 == a-1)&&(i2 == b-1))
            {
                printf("(%d,%d)",setA[i1],setB[i2]);
            }
        }
    }
    printf("}\n");
    printf("The intersection/s of sets {");
    for(i1=0;i1<a;i1++)
    {
        if (i1 != a-1)
        printf("%d,",setA[i1]);
        else if (i1 == a-1)
        printf("%d",setA[i1]);
    }
    printf("} and {");
    for(i2=0;i2<b;i2++)
    {
        if (i2 != b-1)
        printf("%d,",setB[i2]);
        else if (i2 == b-1)
        printf("%d",setB[i2]);
    }
    printf("} is/are {");
    for(i1=0;i1<a;i1++)
    {
        for(i2=0;i2<b;i2++)
        {
            if (setA[i1]==setB[i2])
            {
                printf("%d,",setA[i1]);
               //instead of using printf here I wanted to make it an array 
            }
        }
    }
    printf("}\n");
    return 0;
}

Yes, and.... ???

This sounds like one of the "Can i haz" posts.

What they said.

Anyway, what is this supposed to do, print setA[i1] whether i1 is or isn't equal to a-1? Seems funny...

Code:

        if (i1 != a-1)
        printf("%d,",setA[i1]);
        else if (i1 == a-1)
        printf("%d",setA[i1]);