C宏定义的小结

实现代码实例

程序代码：

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>     

/***** cplusplus *****/
#if 0
#include <iostream>
using namespace std;
#endif     

// 得到指定地址上的一个字节或字
#define MEM_B(x) (*((byte *)(x)))
#define MEM_W(x) (*((word *)(x)))     

// 得到一个field在结构体(struct)中的偏移量
#define FPOS(type, field) ((dword)&((type *)0)->field)     

// 将一个字母字符转换为大写
#define UPCASE(c) (((c)>='a' && (c)<='z') ? ((c)-0x20) : (c))     

// 判断字符是否为十进制的数字
#define DECCHECK(c) ((c)>='0' && (c)<='9')     

// 判断字符是否为十六进制的数字
#define HEXCHECK(hex) (((hex)>='0' && (hex)<='9')||((hex)>='A' && (hex)<='F')||

((hex)>='a' && (hex)<='f'))
// 防止溢出的一个方法
#define INC_SAT(val) (val=((val)+1 > (val)) ? (val)+1 : (val))     

// 计算数组元素的个数
#define ARRAY_SIZE(array) (sizeof(array)/sizeof(array[0]))     

int
main(void)
{
    int x = 0x1234abcd;
    char c = 'a';
    char dec = '5';
    char hex = 'e';
    char array[10] = {'1'};     

    //printf("MEM_B(x): 0x%p/n", MEM_B(x));
    //printf("MEM_W(x): 0x%p/n", MEM_W(x));     

    printf("UPCASE(c): %c -> %c/n", c, UPCASE(c));
    printf("DECCHECK(dec): %c -> %d/n", dec, DECCHECK(dec));
    printf("HEXCHECK(hex): %c -> %d/n", hex, HEXCHECK(hex));
    printf("ARRAY_SIZE(array): array[10] -> %d/n", ARRAY_SIZE(array));     

    printf("/n/****** MACRO ******//n");
    printf("__LINE__: %d/n", __LINE__);
    printf("__FILE__: %s/n", __FILE__);
    printf("__DATE__: %s/n", __DATE__);
    printf("__TIME__: %s/n", __TIME__);
    printf("__func__: %s/n", __func__);
#ifdef __cplusplus
    cout <<"hello __cplusplus"<<endl;
#endif
#ifdef __STDC__
    printf("hello __STDC__/n");
#endif     

    printf("/n/****** sizeof() ******//n");
    //printf("sizeof(byte): %d/n", sizeof(byte));
    printf("sizeof(char): %d/n", sizeof(char));
    printf("sizeof(signed char): %d/n", sizeof(signed char));
    printf("sizeof(unsigned char): %d/n", sizeof(unsigned char));
    printf("sizeof(short): %d/n", sizeof(short));
    printf("sizeof(signed short): %d/n", sizeof(signed short));
    printf("sizeof(unsigned short): %d/n", sizeof(unsigned short));
    printf("sizeof(int): %d/n", sizeof(int));
    printf("sizeof(signed int): %d/n", sizeof(signed int));
    printf("sizeof(unsigned int): %d/n", sizeof(unsigned int));
    printf("sizeof(long): %d/n", sizeof(long));
    printf("sizeof(signed long): %d/n", sizeof(signed long));
    printf("sizeof(unsigned long): %d/n", sizeof(unsigned long));
    printf("sizeof(long long): %d/n", sizeof(long long));
    printf("sizeof(signed long long): %d/n", sizeof(signed long long));
    printf("sizeof(unsigned long long): %d/n", sizeof(unsigned long long));
    printf("sizeof(float): %d/n", sizeof(float));
    printf("sizeof(double): %d/n", sizeof(double));

    exit(EXIT_SUCCESS);
}

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