51assemble

    This is a very simple assembler for 51 serials microcontrollers，and it's also the first 
complete project I handled by my own.
    Thanks to my classmates -- Deng and Gou, they gave me so much help, and then I could get 
ideas to the project, sincerely thankyou so much.
    The project contains only one file, that is "51assemble.cpp"，and I'll optimize it later 
in the rest of this month.

Specification of program:
    Here is the perhaps the procedures of this program, first of all, read the source file 
line by line, and you'll get the instructions, then you should separate the instruction into 
Label，mnemonic, the first operand, the second operand, the third operand, and store them into 
character string, and match the instruction with every line of the "HEX.txt", when you search 
the instruction, you get the machine code of that instruction and the present address, also, 
you should get the label-form and Pseudo instruction form, then you just need to output your 
data, but you should save your data in character string first, and write the string into 
"obj.txt".


程序说明：

    大概思路是这样的，用一个循环逐行读取源文件data.txt的每一行指令，将读取到的指令以标号，助
记符，第一操作数，第二操作数，第三操作数等分别拆开，储存，然后与做好的指令对照表匹配获取机器
码，当前地址，在得到当前地址的同时建立标号表，对于扫描到的伪指令建立伪指令表，然后是输出，以
字符串储存要输出的一行数据，将字符串写入obj.txt即可。

    程序中大量用到16进制字符串转化为整数，整数转为16进制字符串等操作，所以，定义专门的转换函
数很有必要，而我现在也正在为这个发愁，没有完美的实现string_to_int的功能，继续优化中。

I run this program in VS2008.

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change log：

2014/09/17

1.Submit the first alpha version;
2.The program is not fully completed, still thinking of function algorithm;
3.Submit "data.txt" and "HEX.txt";

2014/09/20

1.Achieve the function "sting_to_int";

2014/09/21

1.Achieve the function "get_checksum";
2.Optimize the function "match";
3.Basically completed;
4.just need to optimize the program later;

2014/09/22

1.Optimize the function "get_obj", then it can output hexcode line by line;
2.Fix an error in the function "get_machcode";
3.Optimize the way to memory labeltable;
4.Delete some unnecessary parts;

2014/09/23

1.Owning to the whole night coding, the program just elevate to an beta version;
2.Add the function "replacelab";
3.The only leaving problem is that dummy orders are not processed effectively; 
4.Delete most explanatory notes,  optimize some misleading variable name;