how to change char to formula

Hi,,,

I want to do like this...

for example.. i have a file call formula.txt
so,, in the file,, i wrote a formula for example

x*x*x +2*x

Of coz, this formula is considered as string isn't it??

So,, from a C program,, how can i read this content and change it to a meaning math formula...

in another mean,,
after read the content from formula.txt,,,

i want to like this,,

f(x) = x*x*x +(2*x)

and then do loop to generate f(x)...


please help me....

You will need to read it into a string and then write a function yourself to evaluate the expression with a given value for x. For the loop you could call the function n times with different values for x.

thanks shiro san..

do you mean that i have to write function to split token (like * , + , - , ), ( , and so on) and parameter x ???

wowwww... impossible for me.. may be.!!!

could you suggest me a simplest algo to write it?