BCD编码的数据与基本类型数据之间的转换

/*********************************************************************** BCD编码的数据与基本类型数据之间的转换: BCD码亦称二进码十进数或二-十进制码，用4位二进数来表示1位十进数中的0~9 这10个数码，8421BCD码是最常用的BCD码，只选用4位二进制码中的前10组代码， 即用0000~1001，来分别表示它所对应的十进制数，而余下的六组代码不用。 ************************************************************************/ #include <stdio.h> unsigned char CharToBCD(unsigned char hex) { unsigned char bcd; bcd = ((hex>>4) & 0x0F) * 10; bcd += hex & 0x0F; return bcd; } unsigned char BCDToChar(unsigned char bcd) { unsigned char hex; hex = (bcd/10) * 16 + (bcd%10); return hex; } unsigned short BCDToShort(unsigned short bcd) { unsigned short myshort = 0; myshort = ((bcd>>12) & 0x0F) *1000 + ((bcd>>8) & 0x0F) *100 + ((bcd>>4) & 0x0F) *10 + (bcd & 0x0F); return myshort; } unsigned short ShortToBCD(unsigned short ust) { unsigned short bcd = 0; bcd = (ust/1000) * 4096 + ((ust%1000)/100) * 256 + ((ust%100)/10) * 16 + (ust%10); return bcd; } unsigned long StringToLong(unsigned char *String) { unsigned long Long; Long = (String[0]-'0')*10000000+(String[1]-'0')*1000000+(String[2]-'0')*100000+(String[3]-'0')*10000\ +(String[4]-'0')*1000+(String[5]-'0')*100+(String[6]-'0')*10+(String[7]-'0'); return Long; } int main(int argc, char *argv[]) { unsigned char src_hex = 0x29; unsigned char tar_bcd = 0; unsigned char tar_hex = 0; unsigned short us_src_bcd = 0x4367; unsigned short us_tar_bcd = 0; unsigned short us_tar_hex = 0; char str[9] = "12345678"; unsigned long ul_tar = 0; tar_bcd = CharToBCD(src_hex); printf("src_hex:%02X tar_bcd:%02X = %d\n",src_hex,tar_bcd,tar_bcd); tar_hex = BCDToChar(tar_bcd); printf("tar_bcd:%02X tar_hex:%02X\n",tar_bcd,tar_hex); us_tar_hex = BCDToShort(us_src_bcd); printf("us_src_bcd:%02X us_tar_hex:%02X\n",us_src_bcd,us_tar_hex); us_tar_bcd = ShortToBCD(us_tar_hex); printf("us_tar_hex:%02X us_tar_bcd:%02X = %d\n",us_tar_hex,us_tar_bcd,us_tar_bcd); ul_tar = StringToLong(str); printf("str:%s ul_tar:%d\n",str,ul_tar); return 0; }