將字串型態表示的16位元數字轉為整數資料型態

將字串型態表示的16位元數字轉為整數資料型態

傳入的參數可為 " ffbc"，"FFbC"，"0xFFFC"， "12F4"

//字元 HEX 轉 OCT
int chex2oct(char ch[]){
    unsigned int i, j[10], leng, leng_s=0, chex=0;
    unsigned int hex16[] = {1, 16, 256, 4096, 65536, 1048576, 16777216,268435456};
    leng = strlen(ch);

    for(i=0; i<leng; i++) {
        if(ch[i]>47 && ch[i]<58) j[leng_s++] = ch[i] - 48;
        else {
            switch (ch[i]){
                case 'a': case 'A': j[leng_s++] = 10; break;
                case 'b': case 'B': j[leng_s++] = 11; break;
                case 'c': case 'C': j[leng_s++] = 12; break;
                case 'd': case 'D': j[leng_s++] = 13; break;
                case 'e': case 'E': j[leng_s++] = 14; break;
                case 'f': case 'F': j[leng_s++] = 15; break;
            }
        }
    }

    for(i=0; i<leng_s; i++) chex += j[i] * hex16[leng_s - i - 1];
    return chex;
}