ultra-precise calculator

console calculator with controlled calculation precision

Two types of project files

1a. calculator.pro (qmake)

mkdir build && cd build && qmake .. && make DEFINES=-DUSE_VALUE

1b. CMakeLists.txt (cmake)

mkdir build && cd build && cmake .. && make CXX_DEFINES=-DUSE_VALUE

(2). cpp/CMakeLists.txt (cmake + flex + bison)

(3). java/make.sh (jflex + byaccj)

For 1a and 1b you must choose one of the following macros:

• USE_VALUE
• USE_VERYLONG - Very Long Integer Class from SymbolicC++ : An object oriented computer algebra system written in C++ by Tan Kiat Shi, Willi-Hans Steeb, Yorick Hardy
• USE_BIGINT - unsigned integers using a fixed number of bits from C++ Cookbook by D. Ryan Stephens, Christopher Diggins, Jonathan Turkanis, Jeff Cogswell

Brief description: a program for calculating the value of a given arithmetic expression, operating on numbers with unlimited degree of accuracy.

Input: the input is a string containing an arithmetic expression.

Output: the calculated value of the given expression and display it on the screen. After the output, the program goes into the mode of waiting for the input of the next expressions.

Supported operations:

• + (addition)
• - (subtraction)
• * (multiplication)
• / (division)
• - (unary minus)
• ^ (exponentiation)
• ! (factorial)

Supported functions:

• sin() - sine
• cos() - cosine
• tan() - tangent
• sqrt() - square root

An expression with a unary minus must be enclosed in parentheses so that there is no two consecutive operation signs. For example:

3+(-2)

Before performing calculations and during calculations, it is necessary catch all kinds of errors. Among them, for example:

• Division by zero
• The exponent must be an integer
• The expression under the factorial must be a natural number
• The square root function parameter must be a positive number

Numeric constants can be integer or fractional. Separator of integer and the fractional part is the dot. In the presence of a fractional part, the whole can go down. For example:

1 56 3.5 .001

Additionally, the program specifies the degree of accuracy of calculations for division and calculation of function values. The number of characters after comma, rounding the result to the nearest. For example, the calculation accuracy is set to 5 decimal places, then the result dividing 1 by 3 will be equal to:

0.33333