计算机编码--c语言中输出float的十六进制和二进制编码

　　c语言中没有可以直接打印float类型数据的二进制或者十六进制编码的输出格式，

因此，需要单独给个函数，如下：

unsigned int float2hexRepr(float* a){
    unsigned int c;  
    c= ((unsigned int*)a)[0];   
    return c;
}

int main(int argc, char const *argv[])
{
    printf("%s
", "== in float representation == ");
    float f1 = 15213.0;
    printf("%x
", float2hexRepr(&f1));
}

结果如下：

== in float representation ==
466db400

为了更好看，打印出二进制：

void hex2binaryStr(unsigned int x, char* str){
    unsigned int xCopy = x;
    for (int i = 0; i < 32; ++i)
    {
        str[31 - i] = (xCopy & 1)? '1': '0';
        xCopy = xCopy >> 1;
    }
}

void printBinary(char* str){
    for (int i = 0; i < 32; ++i)
    {
        printf("%c", str[i]);
        if (((1+i)%4 == 0) && ((1+i) != 32))
        {
            printf("%c", ',');
        }
    }
    printf("
");
}

结果如下：

== in float representation ==
466db400
0100,0110,0110,1101,1011,0100,0000,0000

THE END