Thread: C Code for If Evaluation

$IF exp $THEN
"text"
$ENDIF

Consider above if statement, i need a C code to evaluate if statement(Nested if), the above eg will be given as a text file, purpose is to read this file , interpret it and do if Evaluation

In this case it needs code to evaluate complex Expression too...


Can anybody help me in this regard..

What you need for this is to create a grammer first. Without that you will not be able to do anything. Look through some compiler construction books.

There might be chapter realated to grammer creation or something. Which tell you how to solve create a grammer.

ssharish2005

lex & yacc should help a little

i set grammer first after checking grammer i gone for node in which left pointer points to true condition of if statement and right points to false. i tried this for simple if statement it was working fine. Now i am trying to do expression evaluation, if anybody have idea regarding this kindly do me favour

Here's the C code for If evaluation:

Code:

if (condition) {
  // run statements
}

answer ur question?

Expression evaluation? That could range from the simple (x <= 10?) to the complex... (ie, Regular Expressions)...