for循环初始化条件中的scanf无法读取输入，如何解决？(语言-c语言)

unsigned short n = 1;
        double number1=1.0, number2=1.0;
        printf("请输入两个浮点数：\n");
        for (n = scanf_s("%f %f", &number1, &number2); n == 2; n = scanf_s("%f %f", &number1, &number2))
        {
            printf("number1=%f,number2=%f\n", number1, number2);
            printf("所求值为%f\n", Production_divide_difference(number1, number2));
            printf("继续请再次输入两个浮点数，退出请输入q:\n");
        }
        printf("退出");

这是输出结果

img

可以发现number1和number2均未被scanf放入输入的值，依旧是声明变量时初始化的值。
排查了许久也不清楚是哪里出了问题，c语言初学者，还望教导。

scanf_s("%lf %lf", &number1, &number2);
double类型要用%lf