数据转换-16进制字符

在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

uitls.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[] = {'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");}
    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");}
        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("%c对应的数是%d\n",c2,n2);
}

运行截图：