short : Yet Another Eval Replacement author : Peter Gordon uploader : mrustler gmx de (Matthias Rustler) type : util/cli version : 1.0 architecture : i386-aros Filetype : application/zip Size : 27.08K Date : 30-Dec-08 Download : 馃捑
Original Readme ~~~~~~~~~~~~~~~ Yet Another Eval v1.0 ===================== By Peter Gordon (pete at 1. What is it? -------------- YAE is another replacement for the standard AmigaOS eval command, although it is not a direct replacement since it doesn't currently use the same argument format. It has the following advantages over Eval: 脗路 Operator precedence 脗路 Boolean operators 脗路 Floating point mode with various trigonometry and logarithmic functions 脗路 Integers can be expressed in decimal, hexadecimal or binary 脗路 The source is freely available 脗路 64bit integer math, double precision floating point math 2. Usage -------- YAE takes the following arguments: EXPRESSION/A,FLOAT/S,HEX/S The first is the expression to evaluate. If the "FLOAT" switch is specified, the expression will be evaluated as double-precision floating point instead of integer. If the "HEX" switch is specified, the output will be in hex instead of decimal. If the expression contains spaces, or an equals sign, you should enclose it in quotes ("). 3. Specifying values -------------------- In integer mode, numbers are specified in decimal, binary, or hex: Decimal = 100 Hex = $64 or 0x64 Binary = %1100100 Values can also be retrieved from environment variables. Simple put the variable name, enclosed in apostrophes, into the expression. For example: 1+'myvar' adds one to the value in the environment variable named myvar. 4. Operators ------------ YAE supports two types of operators; unary and binary. Unary operators precede a value and affect only the value immediately after them, such as the unary minus (swap sign): -1 means minus one. Brackets can be used after a unary operator, in which case it will affect the result of the expression in the brackets: -(2+1) means minus three. -(-1) means 1 :) YAE knows the following unary operators: Operator Description Integer mode? Float mode? ------------------------------------------------------------ - Unary minus Yes Yes ABS Absolute value Yes Yes NOT Binary invert Yes No ~ Binary invert Yes No SIN Sine No Yes COS Cosine No Yes TAN Tangent No Yes SINH Hyperbolic Sine No Yes COSH Hyperbolic Cosine No Yes TANH Hyperbolic Tangent No Yes ASIN Arcsine No Yes ACOS Arccosine No Yes ATAN Arctangent No Yes SQRT Square root Yes Yes LOG Logarithm Yes Yes LOG10 Logarithm Yes Yes EXP Exponential func No Yes ROUND Round to nearest No Yes CEIL Round up No Yes FLOOR Round down No Yes TRUNC Truncate No Yes Binary operators operate on two values to provide a result (not to be confused with bit-wise operations). YAE knows the following binary operators: Operator Description Precedence Integer mode? Float mode? ------------------------------------------------------------------------- * Multiply 3 Yes Yes 脙 Multiply 3 Yes Yes / Divide 3 Yes Yes 脙路 Divide 3 Yes Yes + Add 4 Yes Yes - Subtract 4 Yes Yes ^ Power 3 Yes Yes MOD Modulo 3 Yes No XOR Exclusive or 6 Yes No SHR Shift right 3 Yes No >> Shift right 3 Yes No SHL Shift left 3 Yes No << Shift left 3 Yes No AND And 5 Yes No & And 5 Yes No OR Or 5 Yes No | Or 5 Yes No = Equal to 7 Yes No > Greater than 7 Yes No < Less than 7 Yes No != Not equal to 7 Yes Yes >= Greater or equal 7 Yes Yes <= Less than or equal 7 Yes Yes (note: the precedence column is a bit counter-intuitive; the lower number operators will be evaluated before the higher number ones) examples: 1.Workbench:> yae "1=2" 0 1.Workbench:> yae sin(1.25) float 0.948985 1.Workbench:> yae $64 100 1.Workbench:> yae 2+3*4+5*6 44 and so on... 5. To Do -------- Please feel free to tackle these yourself and pass the source changes back :) 脗路 Better documentation 脗路 AmigaGuide or HTML documentation 脗路 Better output format control 脗路 Suggestions? Uploaded using:
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