十六进制转化二进制[c]-白红宇

十六进制转化二进制[c]

阅读量：4678 次

发布时间：2019-06-09

本文共 1273 字，大约阅读时间需要 4 分钟。

#include
     
      #include
      
       #include
       
        int hex2dec(char c){    int i=0;    //char cc[1]={0};    //cc[0]=c;    if(c>='0'&&c<='9')          i=c-'0';       //('0')48-48=0    else if(c>='A'&&c<='Z')        i=c-'0'-7;    //(A)65-48-7=10    else if(c>='a'&&c<='z')        i=c-'0'-39;  //(a)97-48-39=10    //if(cc[0]>='0'&&cc[0]<='9')   //       i=cc[0]-'0';       //('0')48-48=0    //else if(cc[0]>='A'&&cc[0]<='Z')    //    i=cc[0]-'0'-7;    //(A)65-48-7=10    //else if(cc[0]<='a'&&cc[0]<='z')    //    i=cc[0]-'0'-39;  //(a)97-48-39=10    else    {        printf("error!\n");        exit(0);    }    return i;}int main(){    int j=0;    int index=0;    char print[65]={
   0};    char *str[16]=    {        "0000","0001","0010","0011",    //0-3        "0100","0101","0110","0111",    //4-7        "1000","1001","1010","1011",    //8-11        "1100","1101","1110","1111"     //12-15    };    char hex[17];    while (1)    {        scanf("%s",hex);        for(j=strlen(hex)-1;j>=0;j--)        {            index=hex2dec(hex[j]);            strcat(print,str[index]);            strcat(print," ");        }        printf("%s转化结果:%s\n",hex,print);        memset(print,0,65);    }    }