Question

void test()
{
       int buf[1000];

       //populate buf
       foo(buf);//is this correct? Can we pass buf as a pointer that foo expects?



}
void foo(void*ptr)
{}

EDIT:
if foo were fwrite, would the above(mechanism of passing buf so as to supply fwrite with content to write into some file) still be applicable?

Answer 1

Its perfectly valid in C. foo argument is a pointer that can point to any type. When you pass an array, it decays to a pointer pointing to the first element of the array (i.e.,address location of the first element is passed). So,

 ptr -> &buf[0] ;