c语言实现面向对象编程

1.通用校验器接口(validator.h)

 #ifndef VALIDATOR_H_INCLUDED
 #define VALIDATOR_H_INCLUDED

 #include<stdbool.h>

 typedef struct _Validator{
     bool (*const validate)(struct _Validator *pThis, int value);
 }Validator;

 typedef struct{
     Validator isa;    //结构体成员
     const int min;
     const int max;
 } RangeValidator;

  typedef struct{
     Validator isa;    //结构体成员
     bool isEven;
  } OddEvenValidator;

 bool validateRange(Validator *pThis, int value); // 范围校验器函数
 bool validateOddEven(Validator *pThis, int value); // 奇偶校验器函数
 #define newRangeValidator(min, max) {{validateRange}, (min), (max)} // 初始化RangeValidator
 #define newOddEvenValidator(isEven) {{validateOddEven}, (isEven)} //  初始化OddEvenValidator

 #endif // VALIDATOR_H_INCLUDED

2.通用校验器接口实现(validator.c)

 #include "validator.h"

 bool validateRange(Validator *pThis, int value)
 {
     RangeValidator *pRangeValidator = (RangeValidator *)pThis;
     return pRangeValidator -> min <= value && value <= pRangeValidator -> max;
 }

 bool validateOddEven(Validator *pThis, int value)
 {
     OddEvenValidator *pOddEvenValidator = (OddEvenValidator *)pThis;
     return (!pOddEvenValidator -> isEven && (value % )) || (pOddEvenValidator -> isEven && !(value % ));
 }

3.通用校验器使用范例程序

 #include <stdio.h>
 #include "validator.h"

 int main()
 {
    int  num;
    RangeValidator rangeValidator = newRangeValidator(, );// 初始化RangeValidator
    Validator *pValidator = &rangeValidator.isa;
    printf("Pease input an integer: ");
    scanf("%d",&num);
    printf("\n");

    if(pValidator->validate(pValidator,num) == true)
    {
         printf("The %d in range of 1 to 10\n",num);
    }
    else
    {
         printf("The %d not in range of 1 to 10\n",num);
    }
     printf("\n");

    OddEvenValidator oddEvenValidator = newOddEvenValidator(true);// 初始化OddEvenValidator
    pValidator = &oddEvenValidator.isa;

     printf("Pease input an integer: ");
    scanf("%d",&num);
    printf("\n");

    if(pValidator->validate(pValidator,num) == true)
    {
         printf("The %d is an even.\n",num);
    }
    else
    {
         printf("The %d is an odd.\n",num);
    }
     return ;
 }