void example(char acHello[])

char acHello[]  是char指针

char * acHelloc;

看看函数的实参形参如何传递吧

int  array[] = { 1, 2, 3, 4, 5 };
sizeof( array )是20
sizeof( array[0] )是4

int  array[] = { 1, 2, 3, 4, 5 };
int *p=array;
sizeof(p)是4