Numbers

GNU Emacs supports two numeric data types: integers and floating-point numbers. Integers are whole numbers such as −3, 0, 7, 13, and 511. Floating-point numbers are numbers with fractional parts, such as −4.5, 0.0, and 2.71828. They can also be expressed in exponential notation: ‘1.5e2’ is the same as ‘150.0’; here, ‘e2’ stands for ten to the second power, and that is multiplied by 1.5. Integer computations are exact. Floating-point computations often involve rounding errors, as the numbers have a fixed amount of precision.

• Integer Basics
• Floating-Point Basics
• Type Predicates for Numbers
• Comparison of Numbers
• Numeric Conversions
• Arithmetic Operations
• Rounding Operations
• Bitwise Operations on Integers
• Standard Mathematical Functions
• Random Numbers