Higher Order Calculator with flex and bison.
Orginal concept for this project is based on that in The Unix Programming Environment by Brian Kernighan and Rob Pike.
Features.
- Common mathamtical operators ( +, - , *, /, ^(power))
- User can utilize existing functions like sin, cos, tan, sqrt, log, exp. These functions take single double value argument and result of function call is similar to that in the C specificaiton.
- User can input one line of statement at once.
- After each input line, statement value will be printed to console.
- Internally all the values handle as double
- Does not allow user to define new functions. Can only use exsisting functions.
- User can define variable using declare var_name construct to persist the values for later use.
- Type quit to exist the program.
- Variable name can only be alpha.
Implementation details
- Symbol table has implemented using std::map struncture and functions (sin, cos etc:) are added to the map in main.c
- Function are internelly called to corresponding function pointers in cmath.h header.
Improvements
- User define functions, and more than one argument functions.
- Multi type variable support.
- Memory optimizations / avoid creating duplicate objects etc.
Examples syntax
9+3
declare var
declare varx
var = 15
varx = sin(var)^2 + cos(var)^2
Screen shot
