mathexpr.h

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/******************************************************************************
**  MODULE:        MATHEXPR.H
**  PROJECT:       SWMM5
**  DESCRIPTION:   header file for the math expression parser in mathexpr.c.
**  AUTHORS:       L. Rossman, US EPA - NRMRL
**                 F. Shang, University of Cincinnati
**  VERSION:       5.1.001
**  LAST UPDATE:   03/20/14
******************************************************************************/
 
#ifndef MATHEXPR_H
#define MATHEXPR_H
 
//  Node in a tokenized math expression list
struct ExprNode {
    int opcode;            // operator code
    int ivar;              // variable index
    double fvalue;         // numerical value
    struct ExprNode* prev; // previous node
    struct ExprNode* next; // next node
};
typedef struct ExprNode MathExpr;
 
//  Creates a tokenized math expression from a string
MathExpr* mathexpr_create(char* s, int (*getVar)(char*));
 
//  Evaluates a tokenized math expression
double mathexpr_eval(MathExpr* expr, double (*getVal)(int));
 
//  Deletes a tokenized math expression
void mathexpr_delete(MathExpr* expr);
 
#endif //MATHEXPR_H