C语言指针

来源江科大视频

将复杂格式的数据转换为字节，方便通信与存储

#include <stdio.h>

/*********************/
unsigned char AirData[20];
void SendData(unsigned char*data, unsigned char count)
{
	unsigned char i;
	for (i=0;i<count;i++)
	{
		AirData[i] = data[i];
	}


}
void ReceiveData(unsigned char*data,unsigned char count)
{
	unsigned char i;
	for (i = 0; i < count; i++)
	{
		data[i] = AirData[i];
	}


}
/*********************/
int main(void)
{   
	unsigned char i;
	unsigned char Datasend[] = { 0x12,0x34,0x56,0x78 };
	SendData(Datasend, 4);
	float num = 12.345;

	unsigned char* p;
	p =(unsigned char*) & num;
	SendData(p, 4);

	/*********************/
	printf(" \nAirData=");
	for (i = 0; i < 20; i++)
	{
		printf("%x  ", AirData[i]);
	}

	unsigned char DataReceive[4];

	float* fp;
	ReceiveData(DataReceive, 4);
	fp = (float*)DataReceive;
	
	printf(" \nnum=%f", *fp);
		return 0;
}