C language: whether to continue every 100 units or not

for (i = 1; i <= 1000; i++) {
        if (i % 7 == 0)
            printf("%d ", i);

        if (i == 100 || i==200 || i==300 || i==400 || i==500||i==600||i==700||i==800||i==900||i==1000) {
            printf("Continue(y/n)? ");
            scanf("%c", &a);
            if (a == 'y')
                continue;
            else
                break;
        }