Error "expression must have integral or enum type" in thats code:

Question

Error "expression must have integral or enum type" in thats code:

__global__ void VectorKernel(float *a, float *b, float *c, int n)
{
    int i = threadIdx.x;
    float y = 0, z = 0;

if (i < n)

    y = (b-a) / n;

    for (float j = y; j <= n ; j++) {
        z = (((j+y) - j) / 6) * function(j) + 4 * (function((j + (y+j)) / 2)) + function(y+j);

        c = c + z;
    }
}

the error happen in "z", in stretch:

c = c + z;

(i'm beginner in CUDA programming)

Answer 1

c is a pointer. Pointer arithmetic requires a pointer and an integer type expression.

If you want to to add z to the float pointed to by c you should change the expression to:

*c = *c + z;