wix cin

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On the efficiency of Cin,cout and scanf,printf

Disclaimer: This article turns from a few 1234 blogs In the contest, when the large data is encountered, the reading file becomes the bottleneck of the running speed of the program, and it needs a faster reading mode. It is believed that almost all C + + learners have stumbled over the slow speed of the CIN machine, and have vowed not to read the data on the CIN. Others say that the speed of Pascal's read s

When cin fails to be read, does it enter an endless loop? -Analyze input stream conditions

Consider the following code: # Include Using namespace std; Int main (){Int;While (cout Cout Return 0;} The intention is to allow the user to select a number ranging from 1 to 10. If it is not a number ranging from 1 to 10, re-enter it. Analysis: If the user inputs an int not greater than 1-10, the program runs correctly and prompts the user to re-enter it. However, if the user mistakenly inputs a character char, the result is that the while loop is always executed! Error analysis: When

While (CIN)

Jery's earliest intention was to support a pure test of an iostream class object, like this: If (CIN )... To enable CIN to obtain a real value, Jerry first defines a conversion operator for it, namely, operator int (). In the case of good behaviors such as above, it can indeed run correctly. But in the following error program design, its behavior will be puzzling: Ci

C + + read keyboard input (Cin/cin.getline ()/cin.get ()/cin.clear ())

1.cin C + + uses CIN to easily read the characters entered by the keyboard, for example: Test input #include First, we enter only one word for each input, as follows: But if we fill in more than two words in the first input: It can be found that the second input has not yet had time to respond, it has been shown. The reason is that CIN uses whitespace (space

C + + Basics: Summary of various input methods, CIN, Cin.get (), Cin.getline (), Getline (), gets (), GetChar () __c++

C + + Basics: Summary of various input methods, CIN, Cin.get (), Cin.getline (), Getline (), gets (), GetChar () Input principle Brief: The input buffer of the program is built with a buffer. Each time the input process is the same, the input data is deposited into the input buffer when the keyboard input is finished 1.cin Read Data according to the variable type of STH in

C ++ BASICS (cout/cin)

The standard output stream in the C ++ programming language interchange stream, which must be supported by iostream. h. Read as "c out ".Directory ExampleCase AnalysisSkill ApplicationCout ControllerOther informationExample # include Using namespace std;Int main (){Int;Cout Cin>;Cout Return 0;}The number entered by the user is saved by cin in variable a and output through cout.# Include Using namespace std;

Differences in scanf and CIN

Differences in scanf and CINCited example: http://www.cnblogs.com/shenben/p/5516996.htmlAs you know, there are two types of inputs and outputs in C + +,-scanf and CIN, but there are differences between them, you know? Let's see the assessment below!Test questions:Enter n number, output n number.test Environment:ubuntu12.04 i3cpu 4G memory 7200 RPM HDDTest Results:Test results using the time test of Linux, the results are as follows: When 10000 sets of

While (CIN> S) Exit

Today, I saw a post on csdn, which reminds me of the while (CIN> S) exit problem. ProgramAs follows: # Include # Include String ># Include # Include # Include Using Namespace STD; Int Main (){Vector String > STR; String S; While (CIN> S)Str. push_back (s ); For (Vector String >:: Iterator it = Str. Begin (); it! = Str. End (); ++ it)Cout " " Sort (Str. Begin (), str. End ()); For (Vector String

How does while (STD: CIN> Val) end?

Reference: 62053816/ --------------------------------------------------------------- CIN is the standard input stream object in the C ++ programming language, that is, the object of the istream class. CIN is mainly used to read data from standard input. The standard input here refers to the terminal keyboard. In addition, cout is the object of the stream, that is, the object of the ostream class. cerr is

How to speed up the input and output of C + + in ACM competition? How to make the cin speed equal to the scanf speed? What is the quickest way to input and output?

In the contest, when the large data is encountered, the reading file becomes the bottleneck of the running speed of the program, and it needs a faster reading mode. It is believed that almost all C + + learners have stumbled over the slow speed of the CIN machine, and have vowed not to read the data on the CIN. Others say that the speed of Pascal's read statement is not as scanf as C + +, C + + players can

An error in Chapter 8 of C ++ primer 4th-missing cin. Ignore

In chapter 8, an example is provided, which is very simple, that is, to read the user input and assign it to an int. Here, a judgment is provided, that is, if the user input is not an int, cin will become invalid, and there will be a condition state, so we can catch this state and clear, and then continue to read. However, the example in the book has an error. The original program is as follows: Code: select all #include #include using na

C + + for most people treats Cin::sync () as an error to clear the buffer function

Baidu Cin::sync (), the majority of the interpretation is used to clear the buffer, and declare the general and Cin::clear () function together to achieve the purpose.The same way Baidu clears the buffer, and most of it says to use Cin::sync () to achieve this goal.      However, Cin::sync () is not used to clear the b

C + +: Why the problem cannot be re-used after cin input CTRL + Z

hahaha, here I come again.A problem occurred today when I wrote a program that required two cycles of input. Paste the code First:#include #includestring>#include#includeusingstd::cout;usingstd::cin;usingStd::endl;usingStd::cerr;usingSTD::string;usingstd::vector;usingStd::out_of_range;intCalcint (vectorstring>vecstr) { inti,sum; for(i =0, sum =0; I!=vecstr.size (); + +i) {sum+=Stoi (vecstr.at (i)); } returnsum;}DoubleCalcdou (vectorstring>vecst

Cin/cin.get ()/cin.getline ()/getline ()/gets ()/getchar ()

1, cin>>Usage 1: Most basic, but also the most common usage, enter a number:#include Input: 2[return]3[carriage return]Output: 5Note that:>> will filter out invisible characters (such as Space return, TAB, etc.)cin>>noskipws>>input[j];//don't want to skip whitespace characters, use NOSKIPWS flow controlUsage 2: Accept a string, the "Space", "tab", "Enter" all end#include Input: JKLJKLJKLOutput: JKLJKLJKLInp

The difference between CIN, Cin.getline (), Cin.get () of instream

cin of Instream problems that occur when CIN is in use CIN uses whitespace (spaces, tabs, and line breaks) to confirm the end of the string when it waits for user input.For example: Enter a Alan Dreeb, then encounter a space, Alan is assigned to the first variable, Dreeb is assigned to the second variable. int main () { char name[20]; Char favorite[20];

Principles of standard input: CIN and scanf

1. Processing Method of CIN 1) if CIN reads an integer, it will automatically ignore line breaks and spaces. When the end mark is reached, the number returned by CIN> A is false. Int; While (CIN> ){ Cout } Return 0; Eg: 1, 2, 3 1 23 1 A2 A 12 Note: When CIN reads the 'A

C + + programming use put to output single character and cin input stream _c language

instead. #include The running result is the same as before. The member function put can be invoked not only with cout stream objects, but also with other stream objects of the Ostream class. C + + cin input Flow detailedThe standard input stream is the data that flows from the standard input device (keyboard) to the program. CIN, cout, Cerr, clog 4 stream objects are defined in header file

Nine degree cin/cout time-consuming reason

Tag: cin cout TimeoutWhen doing the nine-degree problem, due to the large amount of data, in many cases you have to use scanf and printf instead of CIN and cout for input and output, or it will be an error timeout can not AC.There are three recommendations for increasing the input and output speed of C + +: At the first line in main Function,add:std::ios_base::sync_with_stdio (false). Which cancel

An understanding of the CIN Function

Problem Recently I encountered such a problem in C ++, while (CIN> S) {}, which of the following types of input can be used to end the running of such a statement, the answer is Ctrl + Z.ProgramEnd. However, there is no profound analysis of the role of Ctrl + Z and the essence of Ctrl + Z. As a result, I found some content and thought I had solved the problem. The learned content is recorded as follows. First, let's take a look at the conditions for

Input and Output spaces in CIN

Author: horsetail Source:Http://www.cppblog.com/horsetail/archive/2007/10/18/17814.html Because STD: CIN cannot directly accept spaces (spaces are used as the input flag), we need to use a member function STD: CIN in the CIN object. get () accepts a single character. STD: cout. put () member functions are output directly. as follows: # Include Using namespa

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