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关于C语言函数名、取地址函数名、解引用函数名关系
void IsWeekDay() { printf("P(IsWeekDay) = %p\n",IsWeekDay); printf(
"P(*IsWeekDay) = %p\n",*IsWeekDay); printf("P(&IsWeekDay) = %p\n",&IsWeekDay); P
(IsWeekDay) = 0x80484db P(*IsWeekDay) = 0x80484db P(&IsWeekDay) = 0x80484db }
可以看到三者是相等的,解析如下:
IsWeekDay:是函数的首地址,它的类型是void ();
&IsWeekDay:表示一个指向函数IsWeekDay这个对象的地址;&定义说明了一切
它的类型是void (*)(),因此IsWeekDay和&IsWeekDay所代表的地址值是一样的,
但类型不一样。IsWeekDay是一个函数,&IsWeekDay表达式的值是一个指针!
*IsWeekDay:*IsWeekDay 得到函数地址,是因为本来就有相关的规定,表达式 *函数 的值是对应的函数指示符。
所以当传函数一般是传函数名IsWeekDay;
int a[5][5];int **a;
大家可以推导一下关系
int a[5][5]; P(a) = P(&a) = P(*a)