How is this passing of pointers through function working in C?

This is a C code. The aim of the function is to add data which is defined using data pointers ‘*data’

int chksum(int *data) {
    char j;
    int summation = 0;

    for (j = 0; j < 64; j++) {
        summation += data[j]
    }

    return summation;
}

But I am not able to understand that how the data given by the pointer ‘*data’ is getting added using summation += data[j].

My understanding says, the code should be like this:

int chksum(int *data) {
    char j;
    int summation = 0;

    for (j = 0; j < 64; j++) {
        summation += *(data++)
    }

    return summation;
}

>Solution :

We could use *(data++).

But surely you see that’s the same as *(data+j).

And since data[j] is equivalent to *(data+j) by definition, we could also use data[j].