3. 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. Their values are exact. Floating point numbers are numbers with fractional parts, such as -4.5, 0.0, or 2.71828. They can also be expressed in exponential notation: 1.5e2 equals 150; in this example, `e2' stands for ten to the second power, and that is multiplied by 1.5. Floating point values are not exact; they have a fixed, limited amount of precision.

3.1 Integer Basics    Representation and range of integers.

3.2 Floating Point Basics    Representation and range of floating point.

3.3 Type Predicates for Numbers    Testing for numbers.

3.4 Comparison of Numbers    Equality and inequality predicates.

3.5 Numeric Conversions    Converting float to integer and vice versa.

3.6 Arithmetic Operations    How to add, subtract, multiply and divide.

3.7 Rounding Operations    Explicitly rounding floating point numbers.

3.8 Bitwise Operations on Integers    Logical and, or, not, shifting.

3.9 Standard Mathematical Functions    Trig, exponential and logarithmic functions.

3.10 Random Numbers    Obtaining random integers, predictable or not.

This document was generated on May 2, 2002 using texi2html

3.1 Integer Basics		Representation and range of integers.
3.2 Floating Point Basics		Representation and range of floating point.
3.3 Type Predicates for Numbers		Testing for numbers.
3.4 Comparison of Numbers		Equality and inequality predicates.
3.5 Numeric Conversions		Converting float to integer and vice versa.
3.6 Arithmetic Operations		How to add, subtract, multiply and divide.
3.7 Rounding Operations		Explicitly rounding floating point numbers.
3.8 Bitwise Operations on Integers		Logical and, or, not, shifting.
3.9 Standard Mathematical Functions		Trig, exponential and logarithmic functions.
3.10 Random Numbers		Obtaining random integers, predictable or not.