typedef struct Calculator { int (*add)(int a, int b); int (*minus)(int a, int b); int (*multi)(int a, int b); }Cal, * pCal;

这段代码定义了一个名为Calculator的结构体，并使用typedef关键字给它起了一个别名Cal。结构体中包含了三个函数指针成员，分别是add、minus和multi，它们分别指向接受两个int类型参数并返回int类型结果的函数。另外，还定义了一个指向Calculator结构体的指针类型pCal。

这段代码的作用是定义了一个计算器的数据结构，通过函数指针成员可以实现不同的计算操作。可以通过创建Calculator类型的变量或者使用pCal类型的指针来调用这些函数。

相关问题

typedef int *a,*b,*c

This code defines three pointers to integers, named `a`, `b`, and `c`.

It is equivalent to writing:

typedef int *a;
typedef int *b;
typedef int *c;

This allows you to declare variables of type `a`, `b`, or `c` as pointers to integers. For example:

a ptr1;
b ptr2;
c ptr3;

All three of these variables would be pointers to integers.

typedef struct { int* base; int* top; int stacksize; }SqStack;

This is a definition of a struct named SqStack, which represents a stack data structure. It contains three fields:

1. base: a pointer to the bottom of the stack, which is where the first element was added.
2. top: a pointer to the top of the stack, which is where the next element will be added.
3. stacksize: the maximum number of elements the stack can hold.

In C programming language, a struct is a user-defined data type that groups together variables of different data types under a single name. This allows the programmer to manipulate a group of related variables as a single entity.