c语言结构体成员指针

[Mr.L']

将一个 结构体X 成员 设为指向另一 结构体Y 的指针 从而实现通过X对Y进行数据的读取 求示例讲解

[lt199812]

引用 3楼赵4老师 的回复:

#include <stdio.h>
struct _Y {
	int	d1;
	int	d2;
} Y={1,2};
struct _X {
	struct _Y *pY;
} X;
int main() {
    X.pY=&Y;
    printf("(X.pY)->d1,(X.pY)->d2:%d,%d\n",(X.pY)->d1,(X.pY)->d2);
	return 0;
}
//(X.pY)->d1,(X.pY)->d2:1,2
//

可以这样吗 struct ＿x *p； printf（＂%d",p->pY->d1）；

[赵4老师]

不要迷信书、考题、老师、回帖； 要迷信CPU、编译器、调试器、运行结果。 并请结合“盲人摸太阳”和“驾船出海时一定只带一个指南针。”加以理解。 任何理论、权威、传说、真理、标准、解释、想象、知识……都比不上摆在眼前的事实！

//C++ Operators
//  Operators specify an evaluation to be performed on one of the following:
//    One operand (unary operator)
//    Two operands (binary operator)
//    Three operands (ternary operator)
//  The C++ language includes all C operators and adds several new operators.
//  Table 1.1 lists the operators available in Microsoft C++.
//  Operators follow a strict precedence which defines the evaluation order of
//expressions containing these operators.  Operators associate with either the
//expression on their left or the expression on their right;    this is called
//“associativity.” Operators in the same group have equal precedence and are
//evaluated left to right in an expression unless explicitly forced by a pair of
//parentheses, ( ).
//  Table 1.1 shows the precedence and associativity of C++ operators
//  (from highest to lowest precedence).
//
//Table 1.1   C++ Operator Precedence and Associativity
// The highest precedence level is at the top of the table.
//+------------------+-----------------------------------------+---------------+
//| Operator         | Name or Meaning                         | Associativity |
//+------------------+-----------------------------------------+---------------+
//| ::               | Scope resolution                        | None          |
//| ::               | Global                                  | None          |
//| [ ]              | Array subscript                         | Left to right |
//| ( )              | Function call                           | Left to right |
//| ( )              | Conversion                              | None          |
//| .                | Member selection (object)               | Left to right |
//| ->               | Member selection (pointer)              | Left to right |
//| ++               | Postfix increment                       | None          |
//| --               | Postfix decrement                       | None          |
//| new              | Allocate object                         | None          |
//| delete           | Deallocate object                       | None          |
//| delete[ ]        | Deallocate object                       | None          |
//| ++               | Prefix increment                        | None          |
//| --               | Prefix decrement                        | None          |
//| *                | Dereference                             | None          |
//| &                | Address-of                              | None          |
//| +                | Unary plus                              | None          |
//| -                | Arithmetic negation (unary)             | None          |
//| !                | Logical NOT                             | None          |
//| ~                | Bitwise complement                      | None          |
//| sizeof           | Size of object                          | None          |
//| sizeof ( )       | Size of type                            | None          |
//| typeid( )        | type name                               | None          |
//| (type)           | Type cast (conversion)                  | Right to left |
//| const_cast       | Type cast (conversion)                  | None          |
//| dynamic_cast     | Type cast (conversion)                  | None          |
//| reinterpret_cast | Type cast (conversion)                  | None          |
//| static_cast      | Type cast (conversion)                  | None          |
//| .*               | Apply pointer to class member (objects) | Left to right |
//| ->*              | Dereference pointer to class member     | Left to right |
//| *                | Multiplication                          | Left to right |
//| /                | Division                                | Left to right |
//| %                | Remainder (modulus)                     | Left to right |
//| +                | Addition                                | Left to right |
//| -                | Subtraction                             | Left to right |
//| <<               | Left shift                              | Left to right |
//| >>               | Right shift                             | Left to right |
//| <                | Less than                               | Left to right |
//| >                | Greater than                            | Left to right |
//| <=               | Less than or equal to                   | Left to right |
//| >=               | Greater than or equal to                | Left to right |
//| ==               | Equality                                | Left to right |
//| !=               | Inequality                              | Left to right |
//| &                | Bitwise AND                             | Left to right |
//| ^                | Bitwise exclusive OR                    | Left to right |
//| |                | Bitwise OR                              | Left to right |
//| &&               | Logical AND                             | Left to right |
//| ||               | Logical OR                              | Left to right |
//| e1?e2:e3         | Conditional                             | Right to left |
//| =                | Assignment                              | Right to left |
//| *=               | Multiplication assignment               | Right to left |
//| /=               | Division assignment                     | Right to left |
//| %=               | Modulus assignment                      | Right to left |
//| +=               | Addition assignment                     | Right to left |
//| -=               | Subtraction assignment                  | Right to left |
//| <<=              | Left-shift assignment                   | Right to left |
//| >>=              | Right-shift assignment                  | Right to left |
//| &=               | Bitwise AND assignment                  | Right to left |
//| |=               | Bitwise inclusive OR assignment         | Right to left |
//| ^=               | Bitwise exclusive OR assignment         | Right to left |
//| ,                | Comma                                   | Left to right |
//+------------------+-----------------------------------------+---------------+

[ck2333]

#include <stdio.h>

typedef struct {
	int data;
}qwe; 

typedef struct {
	int *a;
	int data;
}asd;

int main ()
{
	asd p;
	qwe q;
	q.data=1;
	p.a=&q.data;
	printf("%d",(*p.a));
	return 0;
}

[Mr.L']

引用 1楼qq_36409192 的回复:

#include <stdio.h>

typedef struct {
	int data;
}qwe; 

typedef struct {
	int *a;
	int data;
}asd;

int main ()
{
	asd p;
	qwe q;
	q.data=1;
	p.a=&q.data;
	printf("%d",(*p.a));
	return 0;
}

我想在结构体中就直接指向另一结构体 读取多个数据

[赵4老师]

#include <stdio.h>
struct _Y {
	int	d1;
	int	d2;
} Y={1,2};
struct _X {
	struct _Y *pY;
} X;
int main() {
    X.pY=&Y;
    printf("(X.pY)->d1,(X.pY)->d2:%d,%d\n",(X.pY)->d1,(X.pY)->d2);
	return 0;
}
//(X.pY)->d1,(X.pY)->d2:1,2
//