把Goolge当成计算器--西部E网weste.net

把Goolge当成计算器

作者：icech 发布时间：2003-10-13 22:29:29 | 【字体：大中小】

今天icech上Google，发现新增了一个非常好玩的功能——计算器。只要在Google的搜索输入框中输入你的计算机公式就可以计算出答案来。下面是Google计算器的使用方法，虽然是英文，但是比较简单，也就不罗嗦翻译了。

How to use the Google calculator

Google’s calculator tries to understand the problem you are attempting to solve without requiring you to use special syntax. However, it may be helpful to know the most direct way to pose a question to get the best results. Listed below are a few suggestions for the most common type of expressions (and a few more esoteric ones).

Most operators come between the two numbers they combine, such as the plus sign in the expression 1+1.

Operator	Function	Example
+	addition	3+44
-	subtraction	13-5
*	multiplication	7*8
/	division	12/3
^	exponentiation (raise to a power of)	8^2
%	modulo (finds the remainder after division)	8%7
choose	X choose Y determines the number of ways of choosing a set of Y elements from a set of X elements	18 choose 4
th root of	calculates the nth root of a number	5th root of 32
% of	X % of Y computes X percent of Y	20% of 150

Some operators work on only one number and should come before that number. In these cases, it often helps to put the number in parentheses.

Operator	Function	Example
sqrt	square root	sqrt(9)
sin, cos, etc.	trigonometric functions (numbers are assumed to be radians)	sin(pi/3) tan(45 degrees)
ln	logarithm base e	ln(17)
log	logarithm base 10	log(1,000)

A few operators come after the number.

Operator	Function	Example
!	factorial	5!

Other good things to know

Parentheses can be used to enclose the parts of your expression that you want evaluated first. For example, (1+2)*3 causes the addition to happen before the multiplication.

The "in" operator is used to specify what units you want used to express the answer. Put the word "in" followed by the name of a unit at the end of your expression. This works well for unit conversions such as: 5 kilometers in miles

You can use hexadecimal, octal and binary numbers. Prefix hexadecimal numbers with "0x", octal numbers with "0o" and binary numbers with "0b". For example: "0x7f + 0b10010101".

The calculator understands many different units, as well as many physical and mathematical constants. These can be used in your expression. Many of these constants and units have both long and short names. You can use either name in most cases. For example, "km" and "kilometer" both work, as do "c" and "the speed of light".

Feel free to experiment with the calculator as not all of its capabilities are listed here. To get you started, we’ve included a few expressions linked to their results.

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