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Operator _ and _ operator priority, operator priority
Mathematical operators (7 ):
+,-, *,/, %, ++, And ,--
1 · % is the remainder operator, for example: 3% 2 = 1 8% 3 = 2
2. ++ and -- are the auto-increment 1 and auto-increment 1 operators.
3. I ++

assignments and operations in the shell are string-handling by default, and here are a few special ways to do mathematical operations in the shell. In the future when you can see, hehe1. Examples of error methodsAVar=1+1Echo $varThe result of the

Date and Time operations:VaR d = new date ();VaR d = new date (, 5); // The time is
D. getfullyear (); yearD. getmonth (); month (normal-1)D. getdate (); DayD. getday (); day of the weekD. gethours ();D. getminutes ();D. getseconds

This article mainly introduces the sorting of common mathematical functions in the math module of Python, and lists the operation priorities of operators, for more information, see the next article. This article mainly describes the common

Original address: http://blog.csdn.net/vagrxie/article/details/4974985Copyright NOTICE: This work is created by nine days Goose Ling, using the Creative Commons Attribution-NonCommercial Use 4.0 International License Agreement license.

In bash, Bash's math is a little awkward, it's hard to adapt and remember, so you have to write a blog post to make it easier to look through. There are four ways to perform mathematical operations:
A, let order
Copy Code code as follows:

A small calculator that can calculate the value of a simple mathematical expression is not a compiler, but a knowledge of the compiler is used. I have been reading some compiler stuff recently. Therefore, writing this simplest calculator is an image

First, the preface
In the usual expression, the two-dollar operator is always placed between the two operational objects associated with it, so this notation is also known as infix notation. Each operator is placed after its operation object,

This article mainly introduces the mathematical functions of the math module in Python, and also makes a list of operator priority, the need for friends can refer to the following
In mathematics, in addition to subtraction arithmetic-this is

1. Examples of error methods
A
Var=1+1
Echo $var
The result of the output is 1+1, tragedy, hehe
b
Var=1
var= $var +1
Echo $var
The output result is 1+1, still tragic, hehe
2. The correct method
1) using Let
Var=1
Let "Var+=1"
Echo $var
The output

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