c - 我的 if, else, else if 循环在 C 中不起作用？

Question

不确定这是否足够，但是我的代码的这一部分不起作用，它一直在“else if”部分下划线，表示它需要一个表达式或一个语句，然后要求一个 (。我如果需要的话可以提供完整的代码我只是觉得我在这里遗漏了一些明显的东西。我已经尝试了一切。谢谢!

    if (total <= AMT1)
    {
        taxes = RATE1 * total;
        printf("your tax rate is: %f\n", taxes);
    }

    else if
    {
        (total > 300 || total <= 450);
        taxes = RATE2 * total;
        printf("your tax rate is: %f\n", taxes);
    }


    else if
    {
        (total > 450);
        taxes = RATE3 * total;
        printf("your tax rate is: %f\n", taxes);
    }

}

}

Answer 1

if (total <= AMT1)
{
    taxes = RATE1 * total;
    printf("your tax rate is: %f\n", taxes);
}

else if(total > 300 || total <= 450)
{
    taxes = RATE2 * total;
    printf("your tax rate is: %f\n", taxes);
}


else if(total > 450)
{
    taxes = RATE3 * total;
    printf("your tax rate is: %f\n", taxes);
}