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Package four;public class Fouronetwo {public static void Main (String args[]) {Double sum = 0,a = 1;int i = 1;while (I {sum = sum+a;i = i+1;A = A * (1.0/i);}SYSTEM.OUT.PRINTLN (sum);}}Explanation: When I=1, Sum=1, i=2, a=

In the shell, see ">1" and ">2" always do not understand what meaning. After the search on the internet to dispel doubts. Actually, this is two kinds of output. In a shell program, the most commonly used FD (file descriptor) is about three, respectively: 0 is a file descriptor that represents the standard input (stdin)1 is a file descriptor representing the sta

Tags: description command gadget should--standard standard output dev fileThis article was reprinted from: 11595985By default, there are always three files open, standard input (keyboard input), standard output (output to screen), standard error (also output to screen), and their respective file descriptors are 0,1,2. So let's take a look at the differences between the following redirection methods:>/dev/null 2>1In fact, it should be equivalent to thi

On the shell:0 indicates standard input1 indicates standard output2 indicates standard error output> default to standard output redirect, same as 1>2>1 means redirecting the standard error output to the standard output.>file means to redirect both the standard output and the standard error output to fileTo speak with an example:

[APUE exercise 3.5]./A. out> Outfile 2> 1 and./a. out 2> 1> Differences Between outfile　　Int main (){Printf ("output to stdio \ n ");Fprintf (stderr, "output to stderr \ n ");Return 1;}The result is as follows:　　Qun @ ThinkPad ~ /Tmp $./a. out> outfile

Problem description: there are now n ordered arrays in M groups, such as {1, 2, 3, 4}, {2, 3, 6}, {1, 3, 5, 7 }, select the data smaller than K in these arrays and return this value. Idea: Compare the minimum data selected each time by referring to the process of merging two Arrays

By default, there are always three files open, standard input (keyboard input), standard output (output to screen), standard error (also output to screen), and their respective file descriptors are 0,1,2. So let's take a look at the differences between the following redirection methods:>/dev/null 2>1In fact, it should be equivalent to this: 1>/dev/null 2>/dev/nul

2-1 Linux operating system and common commands, 2-1 Linux Edit it based on the beginner videos 2-1 and 2-2 of Marco's linux

Float floating "1" clear: both clear floating; "2" set parent element overflow: hidden to clear floating, "1" and "2" Floating float Figure 1 First clear floating: add an empty element and set its css style to clear: both; Figure

QML ranges from 1 to 2, and qml ranges from 1 to 2. As the project goes deeper, it needs to be transplanted to Android. The problem is that QML Android is compatible! Fortunately, the PC-side program is similar to the cell phone screen width ratio. Although the unit pixels and sizes are different, you can use proportio

What is a file descriptor. A file descriptor is a simple positive integer that identifies each file and socket that is opened by the process. The first three file descriptors (0,1,2) correspond to standard input (stdin), standard output (stdout), and standard error (STDERR) respectively. difference between "2>1 > File" and "> File 2>

Description defines a recursive function sumint sum (int n); function declaration, return 12+22+32+......+n2 and note: Sum is the value of the recursive function input positive integer n output12+22+32+......+n2 and sample Input5sample Output55/* Copyright (c) 2014, Yantai University School of Computer * All rights reserved. * File name: Test.cpp * Chen Dani * Completion Date: June 1, 2015 * version number: v1.0 * * #include Experience: This is a s

Would you like to send a value from PHP page 1 to 2, and then to pass 2 results back to the 1 show how to implement? Title I found the web based on HTML $_get[], this method must have a submit value, and return after the display is null Then read the net with JSON value, the result is half said JSON has double quotatio