我创建了一个对象,它实际上表示存储在 char 中的 8 个布尔值数组。我做了更多关于按位运算符和在 C 中创建自己的对象的知识。所以我有两个问题:
- 我可以确定以下代码是否始终有效吗?
- 这是一个很好的实现来制作一个不会在 C 中丢失的对象,除非你自己释放它。
编码:
/*
* IEFBooleanArray.h
* IEFBooleanArray
*
* Created by ief2 on 8/08/10.
* Copyright 2010 ief2. All rights reserved.
*
*/
#ifndef IEFBOOLEANARRAY_H
#define IEFBOOLEANARRAY_H
#include <stdlib.h>
#include <string.h>
#include <math.h>
typedef char * IEFBooleanArrayRef;
void IEFBooleanArrayCreate(IEFBooleanArrayRef *ref);
void IEFBooleanArrayRelease(IEFBooleanArrayRef ref);
int IEFBooleanArraySetBitAtIndex(IEFBooleanArrayRef ref,
unsigned index,
int flag);
int IEFBooleanArrayGetBitAtIndex(IEFBooleanArrayRef ref,
unsigned index);
#endif
/*
* IEFBooleanArray.c
* IEFBooleanArray
*
* Created by ief2 on 8/08/10.
* Copyright 2010 ief2. All rights reserved.
*
*/
#include "IEFBooleanArray.h"
void IEFBooleanArrayCreate(IEFBooleanArrayRef *ref) {
IEFBooleanArrayRef newReference;
newReference = malloc(sizeof(char));
memset(newReference, 0, sizeof(char));
*ref = newReference;
}
void IEFBooleanArrayRelease(IEFBooleanArrayRef ref) {
free(ref);
}
int IEFBooleanArraySetBitAtIndex(IEFBooleanArrayRef ref, unsigned index, int flag) {
int orignalStatus;
if(index < 0 || index > 7)
return -1;
if(flag == 0)
flag = 0;
else
flag = 1;
orignalStatus = IEFBooleanArrayGetBitAtIndex(ref, index);
if(orignalStatus == 0 && flag == 1)
*ref = *ref + (int)pow(2, index);
else if(orignalStatus == 1 && flag == 0)
*ref = *ref - (int)pow(2, index);
return 0;
}
int IEFBooleanArrayGetBitAtIndex(IEFBooleanArrayRef ref, unsigned index) {
int result;
int value;
value = (int)pow(2, index);
result = value & *ref;
if(result == 0)
return 0;
else
return 1;
}
我更像是一个 Objective-C 的人,但我真的想更多地学习 C。任何人都可以要求更多我可以提高自己的“家庭作业”吗?
谢谢,ief2