关于error: invalid types 'int*[double]' for array subscript|的问题求帮助

问题遇到的现象和发生背景

|84|error: invalid types 'int*[double]' for array subscript|

用代码块功能插入代码，请勿粘贴截图

double polynomialVal(int *pt,double x)
{
    double i,k,he = 0,l;
    k = pt[0] + 2;
    for (i = 1;i < k; ++i) {
        l = (double)pt[i];
        he = he + l * (pow(x,i - 1));
    }
    return he;
}

我想要达到的结果

问下这个错误怎么解决

把i定义成int

double polynomialVal(int *pt, double x)
{
    double  k, he = 0, l;
    int i = 0;
    k = pt[0] + 2;
    for (i = 1; i < k; ++i) {
        l = (double)pt[i];
        he = he + l * (pow(x, i - 1));
    }
    return he;
}

double polynomialVal(int *pt,double x)
{
    int i,k;
    double he = 0.0;
    k = pt[0] + 2;
    for (i = 1;i < k; ++i) {
        he = he + pt[i] * pow(x,(double)(i - 1));
    }
    return he;
}