Dynamically create Identifiers?

**mcrewry** · 12-28-2006

I'm working on a little program to read mathematical expressions, solve the equations and print out the answers.

The problem is that it has to support variables.

Example:

a+2 = 3

and in the future, while running the program, I may use the value of 'a' ,that's supposed to be calculated by the program from the expression above, to find the value of yet another variable ('b').

Example:

a+b = 5

I've started to implement the program, but I can't figure out how to dynamically create identifiers with the names of the variables from the equations.

Does anyone know how I can do this?

**dwks** · 12-28-2006

Sure -- you could have an array like the following

Code:

int variable[26];  /* For variables 'A' - 'Z' (case insensitive) */

Or a data structure like this

Code:

struct variable_t {
    const char *name;
    double value;
};

and then an ordinary array, a dynamically allocated array, or some other data structure.

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