**tval** is an easy to use shell application for quick and easy calculation.

Why ?

When I'm working on a project and I need a quick calcul I usualy use Python. The problem is that it require many step.

• I launch python
• If i need some math function like log10 or exp I need to import the math module.
• And then I can type my calcul and get the result.

This is to many step for a quick calcul this is why I created tval for Terminal (Math Expression) Evaluation.

How to build ?

To build tval it's easy. There is 2 way of doing it.

Using the build script

./build.sh

It will juste generate the tval executable.

Using Make

make install

It will install tval in your /usr/local/bin folder.

How to use ?

To use tval it's easy !

tval [OPTIONS] "EXPRESSION"

Options

There is several options you can have access :

• -h, --help : Print the help message
• -p PRECISION : Set the precision of the result (default : 12)
• -s : Print the result in the scientific format

Example

tval "2 +5/2"
4.500000000000

tval -p 0 "sin(pi)"
-0

tval -s -p 2 "2*pi + 230"
2.36e+02

Available Constants and Functions

Constants

• pi/pie : 3.141592653589793238462643383279502884197
• e : 2.7182818284590452353602874713526624977572
• gr (golden ratio): 1.61803398874989484820458683436563811

Functions

• log, log10, log2
• exp
• tanh, sqrt
• sin, cos, tan, atan

Todos

Bugs

• Expression like tan(pi/2) should return inf and not the maximum value for a long double.
• There is an error when evaluating -5 due to the way I handle operators

What I want to work on ?

• Include more functions and constants.
• Add complex numbers

Foot note

I love working on this project. If you have any suggestion about new fonctionnalities dont hesitate !