0. 在openEuler(推荐)或Ubuntu或Windows(不推荐)中完成下面任务
1. 在附件中的utils.h和utils.c中完成16进制字符'0'-'9','A'-'F','a'-'f'与十六进制数据0-15的转换功能（10’）：

int Hex2Char(unsigned int fromi,unsigned char * toc);
int Char2Hex(unsigned char fromc,unsigned int * toi);

2. 并写出测试代码测试上述函数(不能与下面代码一样)，比如：（10’）

unsigned char  c;
Hex2Char(1, &c)
//结果：c = '1'
Hex2Char(15, &c)
//结果：c = 'F'
unsigned int i;
Char2Hex('1', &i);
//结果：i = 1
Char2Hex('F', &i);
//结果：i = 15

3. 提交代码（或代码链接）和运行结果

代码

utils.h

#ifndef _UTIL_H_
#define _UTIL_H_

//char Hex2Char(int i);
//int Char2Hex(char c);

int Hex2Char(int fromi,char * toc);
int Char2Hex(char fromc,int * toi);

int Bitstr2ByteArr(char * bs,char * ba);
int ByteArr2Bitstr(char * ba,char * bs);

int Int2ByteArr(int i,char * ba);
int ByteArr2Int(char * ba,int * i);

#endif

utils.c

#include<stdio.h>
#include"utils.h"
char Hstr[16] = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};

int Hex2Char(int fromi,char *toc) {
	if(fromi>=0&&fromi<=9) {
		*toc= fromi+'0';
	} else if(fromi>=10&&fromi<=15) {
		*toc = fromi+'A'-10;
	} else {
		printf("error\n");
	}
	return 0;
}
int Char2Hex(char fromc,int *toi) {
	if(fromc>='0'&& fromc<='9') {
		*toi= fromc-'0';
	} else if(fromc>='A'&& fromc<='F') {
		*toi= fromc-'A'+10;

	} else {
		printf("error\n");
	}
	return 0;
}

main.c

#include<stdio.h>
#include"utils.h"
int main() {
	int n1,n2;
	char c1,c2;
	printf("请输入一个0~15的数：");
	scanf("%d",&n1);
	Hex2Char(n1,&c1);
	printf("对应的16进制字符是%c\n",c1);
	printf("请输入一个16进制字符：");
	scanf("%s",&c2);
	Char2Hex(c2,&n2);
	printf("对应的数是%d\n",n2);
}

运行