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about pointers [2005-4-15]
youalwayscan 发表在 C/C+基础
| Since ++ and -- are either prefix or postfix operators, other combinations of * and ++ and -- occur, although less frequently. For example,
*--p
decrements p before fetching the character that p points to. In fact, the pair of expressions
*p++ = val; /* push val onto stack */
val = *--p; /* pop top of stack into val */
are the standard idiom for pushing and popping a stack;
//////////////////////////////////////////////
Thus if the array daytab is to be passed to a function f, the declaration of f would be:
f(int daytab[2][13]) { ... }
It could also be
f(int daytab[][13]) { ... }
since the number of rows is irrelevant, or it could be
f(int (*daytab)[13]) { ... }
which says that the parameter is a pointer to an array of 13 integers. The parentheses are necessary since brackets [] have higher precedence than *. Without parentheses, the declaration
int *daytab[13]
is an array of 13 pointers to integers. | |
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