Error in Pointer to array program

[abcdef123]

There is a lot of confusion in pointers, partly because the programs in slides have errors. Please help in correcting the error in this program. The error which I get is :

C:\Users\my pc\Documents\C++\Slide8Pointer.cpp [Error] invalid types 'float*[float]' for array subscript
The C++ program is

#include<iostream>
using namespace std;
int main()
{
float v[4];
float &component(float *, float);

for(float k=1; k<=4; k++)
{
component(v,k)=1.0/k;
cout<<"k="<<k<<endl;

}

for(int i=0; i<4; i++)
 {
 	cout<<"v["<<i<<"]"<<v[i]<<endl;
 }
}

float& component(float *v, float k)
{
cout<<"inside function k="<<k<<endl;
	 return (v[k-1]);
}

[Enoizat]

#include <iostream>

double& component(double*, double);

int main()
{
    double v[4];

    for(double k=1; k<=4; k++)
    {
        component(v, k) = 1.0/k;
        std::cout << "k = " << k << '\n';
    }

    for(int i=0; i<4; i++)
    {
        std::cout << "v[" << i << "]" << v[i] << '\n';
    }
}

double& component(double* v, double k)
{
    std::cout << "inside function \"component()\" k = " << k << '\n';
    return (v[static_cast<unsigned>(k)-1]);
}

[abcdef123]

Thanks. I checked, it would work fine even if float k replaced by int k