10 replies to this topic

[jaiii]

Hi,

Can enybody help me ?
I urgent need :

logic expresion vhere logic operateor (> < == != AND OR >= <=) in logical expresion is substitute expresion (function or array)
for example

1 > 3

1 op() 3
where op is function returns operator >

or

1 <expresion> 3

epresion can be function,array,value,macro... etc.

thanka very much.

[Vswe]

So... what do you need help with? And is this for an assignment?

[JCoder]

You cannot do it in C. Operators and functions are not first class objects in C/C++. They cannot be passed as arguments to / from functions.

[Vswe]

Was that an answer to my question(s)?

[jaiii]

No

I need create logical expresuion from parts:

for examle:

bool a= 1> 3

int i1=1;
int i2=3;
Byte op ='>'

int b= I1 op I2 or enythink like this

[WingedPanther]

Are you saying you need to create a parser/interpreter?

[jaiii]

Yes something like this.

[WingedPanther]

To do that, you'll need to create a tokenizer, along with a parser. Then, you'll have to analyze the tokens to decide what to do with them.

1<3 has three tokens: "1", "<", and "3". "1" would need to be converted to an integer, as would "3". "<" would then have to be interpreted as an operator and you would need to call the corresponding operator on the two converted integers.

[jaiii]

Thanks for help

[JCoder]

One of the best parser / lexer generators: ANTLR Parser Generator
Just write the grammar and the parser will be generated for you.

[jaiii]

Thankx I ytry it

By.