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我一直得到一个“expected identifier or“（“错误，但我似乎找不到解决这个问题的方法。
我读到过可能是缺少函数名/定义引起的，我已经有了，所以我不确定还有什么要检查的，因为我正在用CS50自学
验证码：

#include <cs50.h>
#include <stdio.h>

float half(float bill, float tax, int tip); //function declaration

int main(void)

    {
        float bill_amount = get_float("Bill before tax and tip: ");
        float tax_percent = get_float("Sale Tax Percent: ");
        int tip_percent = get_int("Tip percent: ");

        printf("You will owe $%.2f each!\n", half(bill_amount, tax_percent, tip_percent)); //function call
    }

float half(float bill, float tax, int tip); //function definition
    {
        float result, plus_tax;
        float bill = bill_amount;
        float tax = tax_amount / 100;
        int tip = tip_percent / 100;
        plus_tax = bill + bill * tax;
        result = plus_tax + plus_tax * tip;
        return(result);
    }

更新：谢谢你的评论。我已经更新了我的代码，如下所示。

#include <cs50.h>
#include <stdio.h>

float half(float bill, float tax, int tip); //function declaration

int main(void)
{
    float bill_amount = get_float("Bill before tax and tip: ");
    float tax_percent = get_float("Sale Tax Percent: ");
    int tip_percent = get_int("Tip percent: ");

    printf("You will owe $%.2f each!\n", half(bill_amount, tax_percent, tip_percent)); //function call
}

float half(float bill, float tax, int tip) //function definition
{
    float result, plus_tax;
    plus_tax = bill + bill * (tax / 100);
    result = (plus_tax + plus_tax * (tip / 100))/2;
    return(result);
}