[C++知识库]大小端demo

https://blog.csdn.net/qq_39412582/article/details/81433339

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
int Check_sys()
{
    union Un
    {
        char c;
        int i;
    }un;
    un.i = 1;
    return un.c;
}
static void print_hex(const unsigned char *p_data, const int len)
{
	if(NULL == p_data || len < 0)
	{
		return;
	}
	unsigned char data[4096] = {0};
	for(int i = 0; i < len; i++)
	{
		snprintf((char*)data+strlen((char*)data), sizeof(data)-strlen((char*)data), "%02x", p_data[i]);
	}
	printf("adas_client print_hex:%s\n", data);
}
int main()
{
    int ret=Check_sys();   
    if (1 == ret)
    {
        printf("当前模式为小端存储\n");
    }
    else
    {
        printf("当前模式为大端存储\n");
    }
    float hei = 6.89;
    printf("hei:%f %x\n", hei, hei);
    print_hex((const unsigned char *)&hei,4);
     
    double latitude = 30.519898;
    print_hex((const unsigned char *)&latitude,8);
    
    double longitude =119.969229;
    print_hex((const unsigned char *)&longitude,8);
    return 0;
}