en:expressions

An expression can be thought of as as a combination of constants (integer, floating point, and string), functions (built in and user defined), and operators that create a single value when the expression is evaluated.

Numeric expressions in BASIC-256 come in two varieties; 1) integer, and 2) floating point numbers. They are created by using Arithmetic Operators and functions with Numeric Constants and Variables.

Integer Expressions are expressions that return a whole number.

Examples include:

Integer Expressions |
---|

10 |

ABS(-2345) |

int(9.987) |

5*8 |

Positive integer values may also be expressed in binary (base 2), octal (base 8), and hexadecimal (base 16). Precede binary values with 0b (0b1110 = 14), octal with 0o (0o177 = 127), and hexadecimal with 0x (0xff = 255).

Expressions that return a decimal number, even if it ends in .0, are known as floating point expressions.

Examples include:

Floating Point Expressions |
---|

3/7 |

float(56) |

sin(2*pi) |

Very large and small floating point numbers may also be represented in scientific E notation (added in version 0.9.9.46). http://en.wikipedia.org/wiki/Scientific_notation

Scientific E Notation | |
---|---|

E Notation | Decimal Number |

2e0 | 2 |

3e2 | 300 |

1.234e10 | 12340000000 |

-5.3e4 | -53000 |

2e-1 | 0.2 |

5.12e-9 | 0.00000000512 |

Regular Expressions are just normal strings but have a specific format used in searching and replacing text.

en/expressions.txt · Last modified: 2016/08/12 20:11 by admin