how can convert ?

[mnm71]

I want to convert float array1[80] to const float * array2, How can I?

[mbozzi]

How can I?

Implicitly.

float array1[80];
float const* array2 = array1;

Note that array2 is not an array. Rather, it is the address of the first element of array1.

[dutch]

If you just want to pass it to a function that accepts const float *, just pass it:

void func(const float *a, int size)
{
}

int main()
{
    float a[80];
    func(a, 80);  // note that you usually pass a size, too
}