【c语言】位段赋值的例子

// 位段赋值的例子

#include <stdio.h>

int main()
{
unsigned char puc[4];
struct tagPIM
{
unsigned char ucPiml;
unsigned char ucData0 : 1;
unsigned char ucData1 : 2;
unsigned char ucData2 : 3;
}*pstPimData;
pstPimData = (struct tagPIM*)puc;
memset(puc, 0, 4);//全部置0
pstPimData->ucPiml = 2;//0000 0010全部取出
pstPimData->ucData0 = 3;//0000 0011取出1
pstPimData->ucData1 = 4;//0000 0100取出00
pstPimData->ucData2 = 5;//0000 0101取出101
// 0000 0000 0000 0000 0000 0000 0000 0000
// 0000 0010 0010 1001 0000 0000 0000 0000
// 0    2    2    9    0    0    0    0
// 结果即 02 09 00 00
printf("%02x %02x %02x %02x\n", puc[0], puc[1], puc[2], puc[3]);
return 0;
}

<img src="http://img.blog.csdn.net/20150511153114682?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemhhb3lhcWlhbjU1Mg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />