fortbite

A command-line calculator written in Fortran that handles arbitrary precision arithmetic, complex numbers, and matrices.

Building

make

Running

./build/bin/fortbite

Basic Usage

Arithmetic

fortbite> 2 + 3
5.0000000000000000

fortbite> 10 - 4 * 2
2.0000000000000000

fortbite> (10 - 4) * 2
12.000000000000000

fortbite> 2^8
256.00000000000000

fortbite> 27^(1/3)
3.0000000000000000

Precision Control

Specify output precision with ::digits

fortbite> pi
3.1415926535897931

fortbite> pi::10
3.1415926536

fortbite> pi::30
3.141592653589793115997963468544

fortbite> e::15
2.718281828459045

Variables

fortbite> x := 42
42.000000000000000

fortbite> y := x * 2
84.000000000000000

fortbite> x + y
126.00000000000000

Functions

Trigonometric

fortbite> sin(pi/2)
1.0000000000000000

fortbite> cos(0)
1.0000000000000000

fortbite> atan(1) * 4
3.1415926535897931

Logarithmic and Exponential

fortbite> log(e)
1.0000000000000000

fortbite> log10(1000)
3.0000000000000000

fortbite> exp(1)
2.7182818284590451

fortbite> 2^10
1024.0000000000000

Special Functions

fortbite> sqrt(2)
1.4142135623730951

fortbite> factorial(5)
120.00000000000000

fortbite> floor(3.7)
3.0000000000000000

fortbite> ceil(3.2)
4.0000000000000000

Complex Numbers

fortbite> (3 + 4i) * 2
6.0000000000000000+8.0000000000000000i

fortbite> abs(3 + 4i)
5.0000000000000000

fortbite> conj(3 + 4i)
3.0000000000000000-4.0000000000000000i

Matrices

fortbite> [1,2;3,4]
[2x2 matrix]
  1.0000000000000000  2.0000000000000000
  3.0000000000000000  4.0000000000000000

fortbite> A := [1,2;3,4]
[2x2 matrix]
  1.0000000000000000  2.0000000000000000
  3.0000000000000000  4.0000000000000000

fortbite> det(A)
-2.0000000000000000

fortbite> inv(A)
[2x2 matrix]
  -2.0000000000000000  1.0000000000000000
  1.5000000000000000  -0.50000000000000000

fortbite> eye(3)
[3x3 matrix]
  1.0000000000000000  0.0000000000000000  0.0000000000000000
  0.0000000000000000  1.0000000000000000  0.0000000000000000
  0.0000000000000000  0.0000000000000000  1.0000000000000000

Available Functions

Math Functions

• Trigonometric: sin, cos, tan, asin, acos, atan
• Hyperbolic: sinh, cosh, tanh
• Logarithmic: log, ln, log10, log2
• Exponential: exp, exp2, exp10
• Rounding: floor, ceil, round
• Other: sqrt, abs, factorial

Complex Functions

• real or re - real part
• imag or im - imaginary part
• conj - complex conjugate
• arg - phase angle
• cabs - complex absolute value

Matrix Functions

• zeros(m,n) - zero matrix
• ones(m,n) - matrix of ones
• eye(n) - identity matrix
• det - determinant
• inv - inverse
• transpose - matrix transpose

Constants

• pi - 3.14159...
• e - 2.71828...
• i - imaginary unit

Operators

• Basic: +, -, *, /
• Power: ^ or **
• Assignment: :=
• Precision: ::

Commands

• help - show command list
• exit or quit - exit the calculator
• clear - clear screen
• vars - list defined variables

Testing

Run the test suite:

make test

Run specific test categories:

make test-unit        # Unit tests only
make test-integration # Integration tests only

Notes

• Calculations use double precision by default
• The :: precision operator only affects output formatting, not internal precision
• Variable names are case-sensitive
• Matrix operations require compatible dimensions