非printf形式打印各种数据类型的十六进制和二进制

来源：互联网发布：linux的jdk环境变量编辑：程序博客网时间：2024/05/17 22:51

一、源码实现
为了适配各种数据类型，且可以通过sizeof得到此类型的大小，所以这里采用模板形式开发。

以下是实现此功能的源码：

[cpp]
// 把十进制数(long型)分别以二进制和十六进制形式输出
template <typename T>
void displayHexBin(const T& v)
{
    const unsigned char c2h[] = "0123456789ABCDEF";
    const unsigned char c2b[] = "01";

    unsigned char* p = (unsigned char*)&v;
    char* buf = new char [sizeof(T)*2+1];

    // 转为16进制
    char* ptmp = buf;
    p = p + sizeof(T)-1;
    for (int i = 0; i < sizeof(T); i++, --p)
    {
        *buf++ = c2h[*p >> 4];
        *buf++ = c2h[*p & 0x0F];
    }
    *buf = '\0';
    printf("hex format displayed as %s\n", ptmp);
    delete [] ptmp;

    // 转为2进制
    p = (unsigned char*)&v; p = p + sizeof(T)-1;
    ptmp = buf = new char [sizeof(T)*8+1];
    for (int i = 0; i < sizeof(T); i++, --p)
    {
        for (int j = 0; j < 8; j++)
            *buf++ = c2b[(*p >> (7-j)) & 0x1];
    }
    *buf = '\0';
    printf("bin format displayed as %s\n", ptmp);
    delete [] ptmp;
}
// 把十进制数(long型)分别以二进制和十六进制形式输出
template <typename T>
void displayHexBin(const T& v)
{
const unsigned char c2h[] = "0123456789ABCDEF";
const unsigned char c2b[] = "01";

unsigned char* p = (unsigned char*)&v;
char* buf = new char [sizeof(T)*2+1];

// 转为16进制
char* ptmp = buf;
p = p + sizeof(T)-1;
for (int i = 0; i < sizeof(T); i++, --p)
{
*buf++ = c2h[*p >> 4];
*buf++ = c2h[*p & 0x0F];
}
*buf = '\0';
printf("hex format displayed as %s\n", ptmp);
delete [] ptmp;

// 转为2进制
p = (unsigned char*)&v; p = p + sizeof(T)-1;
ptmp = buf = new char [sizeof(T)*8+1];
for (int i = 0; i < sizeof(T); i++, --p)
{
for (int j = 0; j < 8; j++)
*buf++ = c2b[(*p >> (7-j)) & 0x1];
}
*buf = '\0';
printf("bin format displayed as %s\n", ptmp);
delete [] ptmp;
}

二、框图解释
以上代码分为两部分，一个是转为16进制；一部分是转为2进制。

1、以Int为例求它的16进制数

2、以Int为例求它的2 进制数

三、数据测试

1、Int 转16 进制与2进制
[cpp]
// 测试四.1   Int 转16 进制与2进制
    int dSourceOne = 2;
    int dSourceTwo = -2;
    displayHexBin(dSourceOne);
    displayHexBin(dSourceTwo);
// 测试四.1   Int 转16 进制与2进制
int dSourceOne = 2;
int dSourceTwo = -2;
displayHexBin(dSourceOne);
displayHexBin(dSourceTwo);
结果：

2、float 转16进制与2 进制
[cpp]
// 测试四.2   double 转16 进制与2进制
    float fSourceOne = 3.0;
    float fSourceTwo = -2.0;
    displayHexBin(fSourceOne);
    displayHexBin(fSourceTwo);
    printf("\n");
// 测试四.2   double 转16 进制与2进制
float fSourceOne = 3.0;
float fSourceTwo = -2.0;
displayHexBin(fSourceOne);
displayHexBin(fSourceTwo);
printf("\n");

float类型的二进制的存放方式请参考我的另一篇文章：浮点型数据在内存中存储的表示[转载]

3、double 转16 进制与2进制
[cpp]
// 测试四.3   double 转16 进制与2进制
    double dSourceOne = 2.0;
    double dSourceTwo = -2.0;
    displayHexBin(dSourceOne);
    displayHexBin(dSourceTwo);
// 测试四.3   double 转16 进制与2进制
double dSourceOne = 2.0;
double dSourceTwo = -2.0;
displayHexBin(dSourceOne);
displayHexBin(dSourceTwo);

作者：chenyujing1234