将16进制数据转换为字符并打印

#include <stdio.h>
static const char NumToChar[16][2]=
{
	{0,'0'},{1,'1'},{2,'2'},{3,'3'},
	{4,'4'},{5,'5'},{6,'6'},{7,'7'},
	{8,'8'},{9,'9'},{10,'A'},{11,'B'},
	{12,'C'},{13,'D'},{14,'E'},{15,'F'}
};
char num2char(char num);
char numstr2char(char str[],char len);
int main()
{
	char str[12]=
		{
			0xf5,0x43,0x21,0x24,
			0x42,0x36,0x56,0x89,
			0x26,0x48,0x97,0x18
		};
	numstr2char(str,12);	
	return 0;
}
char numstr2char(char str[],char len)
{
	int i;
	for(i=0;i<len;i++)
	{
		printf("%c",num2char((str[i]&0xF0)>>4));
		printf("%c",num2char(str[i]&0x0F));
	}
	printf("\n");
}
char num2char(char num)
{
	return NumToChar[num][1];
}