#include <stdio.h>
#include <string.h>
int prime_numbers(int a, int b);

int main()
{
    int range_b, range_e, saver;
    char answer[10];
    const char*str1 = "yes";

    //int len = strlen(str1);
    //printf("length %d",len);

    while (1)
    {
        /*printf("Enter begin of range : ");
        scanf_s("%d", &range_b);

        printf("\nEnter end of range : ");
        scanf_s("%d", &range_e);
        printf("\n");

        saver = prime_numbers(range_b, range_e);
        printf("%d", saver);

        printf("\nDo you want to stop: \n");
        gets_s(answer);*/
        //igrored
        //int len2 = strlen(answer);
        //printf("answer length %d", len2);
        printf("\nDo you want to stop: ");
        gets_s(answer,10);
        if ((answer == "yes") || (answer == "yes\n") || (answer == "yes\0") )
        {
            break;
        }
        if (strcmp(str1, answer) == 0)//ignored
        {
            break;
        }
        getchar();
        printf("Enter begin of range : ");
        scanf_s("%d", &range_b);

        printf("\nEnter end of range : ");
        scanf_s("%d", &range_e);
        printf("\n");

        saver = prime_numbers(range_b, range_e);

    }
    getchar();
    return 0;
}

int prime_numbers(int a, int b)
{
    int sum = 0;
    for (int i = a; i <= b; i++)
    {
        if ((i % 2 == 0 && i != 2) || (i % 7 == 0 && i != 7) || (i % 5 == 0 && i != 5) || (i % 3 == 0 && i != 3))
        {
            continue;
        }
        sum += i;
        printf("%d ", i);


    }
    printf("\nsum is ");
    return sum;

}