bit array

#include<stdio.h>
#define SIZE(n) (n+8-(n%8))/8
main()
{
    int upper,temp,i;
    printf("Enter the largest number in list ");
    scanf("%d",&upper);
    upper+=1;
    unsigned char list[SIZE(upper)];
    for(temp=0;temp<SIZE(upper);temp++)
        list[temp]=0;
    printf("\nEnter list ");
    scanf("%d",&temp);
    while(temp<upper)
    {
        list[temp/8]=list[temp/8]|(1<<temp%8);
        scanf("%d",&temp);
    }
    for(temp=0;temp<SIZE(upper);temp++)
        for(i=0;i<8;i++)
            if((list[temp]&(1<<i))!=0)
                printf("%d\t",temp*8+i);
    printf("\n");
}