standard conversions: Array-to-pointer conversion

Question

This is the point from ISO :Standard Conversions:Array-to-pointer conversion: $4.2.1

An lvalue or rvalue of type “array of N T” or “array o

Answer 1

One example of this is that any array variable will automatically degenerate into a pointer to it's first element when passed to a function which takes a pointer of the array's type.

Take a look at this section from the C-Faq on Arrays and Pointers. This is equally applicable in C++.

void foo(int *a) {
    a[0] = 1;
}

int main(void) {
    int b[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };

    foo(b);

    printf("b[0] == %d\n", b[0]);
}