“calc” is an interactive calculator tool that provides arbitrary-precision calculations within a terminal environment. It allows users to perform mathematical calculations with extremely high precision, beyond what is typically offered by standard calculators or programming languages.

Here are the key features and functionalities of “calc”:

**Arbitrary Precision**: Unlike traditional calculators or programming languages that often have limited precision, “calc” enables calculations with arbitrary precision. It can handle numbers with a large number of digits, making it suitable for tasks that require high precision, such as scientific computations, cryptography, and numerical analysis.**Interactive Mode**: “calc” provides an interactive mode in the terminal, where users can input mathematical expressions and receive immediate results. This interactive mode allows for iterative calculations and experimentation, providing a convenient environment for exploring mathematical operations.**Mathematical Functions**: “calc” supports a wide range of mathematical functions, including elementary functions like square roots, logarithms, trigonometric functions, and exponential functions. It also offers more advanced functions like factorials, gamma functions, and Bessel functions, empowering users to perform complex mathematical operations.**Expression Evaluation**: Users can enter mathematical expressions directly into “calc” for evaluation. The tool interprets and processes these expressions, performing the required calculations and providing the results promptly. “calc” supports standard arithmetic operations (addition, subtraction, multiplication, division) as well as parentheses for grouping operations.**Variable Assignment**: “calc” allows users to assign values to variables for more complex calculations. Variables can store numeric values, making it easier to reuse values in subsequent calculations. This feature is particularly useful when dealing with lengthy or frequently used numbers.**Conversion and Formatting**: “calc” supports various formatting options, allowing users to display results in different number systems (decimal, binary, octal, hexadecimal) or specify the desired number of decimal places. It can also convert between different units of measurement, such as length, mass, temperature, and more.**Scripting Support**: In addition to the interactive mode, “calc” can run scripts containing a series of calculations or expressions. This feature enables users to automate repetitive calculations or perform complex calculations as part of a larger script or workflow.

“calc” provides a powerful and versatile calculator tool within the terminal environment, offering arbitrary precision calculations, a wide range of mathematical functions, and interactive capabilities. It is a valuable tool for mathematicians, scientists, engineers, and anyone in need of precise calculations and numerical analysis.

## calc Command Examples

1. Start calc in interactive mode:

# calc

2. Perform a calculation in non-interactive mode:

# calc '85 * (36 / 4)'

3. Perform a calculation without any output formatting (for use with pipes):

# calc -p '4/3 * pi() * 5^3'

4. Perform a calculation and then switch to [i]nteractive mode:

# calc -i 'sqrt(2)'

5. Start calc in a specific permission [m]ode (0 to 7, defaults to 7):

# calc -m mode

6. View an introduction to calc:

# calc help intro

7. View an overview of calc:

calc help overview

8. Open the calc manual:

# calc help