C语言字符串类型转为数字

Question

C语言 如何将一个字符串形式16进制，转为16进制数字?具体如下

Answer 1

每两位字符转换为整数，再转换为16进制

    unsigned char str[9] = "55000000";
    unsigned char strResult[4];
    for(int i=0;i<4;i++)
    {
        if(str[i*2] >='A' && str[i*2] <='Z')
            strResult[i] = str[i*2] - 'A';
        else
            strResult[i] = str[i*2] - '0';
       if(str[i*2+1] >='A' && str[i*2+1] <='Z')
            strResult[i] = strResult[i] * 16 + str[i*2] - 'A';
        else
            strResult[i] = strResult[i] * 16 + str[i*2] - '0';    
    }