C program to print prime and composite numbers between 1 to 20.

#include<stdio.h>
#include<conio.h>
int main()
{
    int i, j, count=0, arr[20], k=0;
    printf("\t\tBetween 1 to 20:\n\n");
    printf("Prime Numbers: ");
    for(i=1; i<=20; i++)
    {
        for(j=2; j<i; j++)
        {
            if(i%j == 0)
            {
                count++;
  break;
            }
        }
        if(count==0)
            printf("%d ", i);
        else
        {
            arr[k] = i;
            k++;
        }
        count=0;
    }
    printf("\nComposite Numbers: ");
    for(i=0; i<k; i++)
        printf("%d ", arr[i]);
    getch();
    return 0;
}