Cin Dev C++

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  1. In fact, C has a general mechanism for reading and writing files, which is more flexible than redirection alone. Iostream.h and fstream.h There are types and functions in the library iostream.h that are used for standard I/O. Fstream.h includes the definitions for stream classes ifstream (for input from a file), ofstream (for output to a file.
  2. May 27, 2017  This article mainly discusses the objects defined in the header file iostream like the cin and cout. Standard output stream (cout): Usually the standard output device is the display screen.The C cout statement is the instance of the ostream class. It is used to produce output on the standard output device which is usually the display screen.

The cin object is said to be attached to the standard input device, which usually is the keyboard. The cin is used in conjunction with the stream extraction operator, which is written as which are two greater than signs as shown in the following example. The C Tutorial LearnCpp.com is a free website devoted to teaching you how to program in C. Whether you’ve had any prior programming experience or not, the tutorials on this site will walk you through all the steps to write, compile, and debug your C programs, all with plenty of examples.

Dev-C is a free full-featured integrated development environment (IDE) distributed under the GNU General Public License for programming in C and C.It is written in Delphi. It is bundled with, and uses, the MinGW or TDM-GCC 64bit port of the GCC as its compiler. Dev-C can also be used in combination with Cygwin or any other GCC-based compiler. Dev-C is generally considered a Windows.

(Redirected from Dev-C/C++)
Dev-C++
Dev-C++ showing its updated UI and new variable browsing options
Developer(s)Bloodshed Software until 2005, Orwell (Johan Mes) since 2011
Stable release
Repository
Written inDelphi
Operating systemMicrosoft Windows, Linux (alpha only)
TypeIntegrated development environment
LicenseGNU General Public License
Websiteorwelldevcpp.blogspot.com
www.bloodshed.net at the Wayback Machine (archived March 20, 2016)
Usage

Dev-C++ is a free full-featured integrated development environment (IDE) distributed under the GNU General Public License for programming in C and C++. It is written in Delphi.

It is bundled with, and uses, the MinGW or TDM-GCC 64bit port of the GCC as its compiler. Dev-C++ can also be used in combination with Cygwin or any other GCC-based compiler.[1]

Dev-C++ is generally considered a Windows-only program, but there are attempts to create a Linux version: header files and path delimiters are switchable between platforms.

Devpaks[edit]

An additional aspect of Dev-C++ is its use of DevPaks: packaged extensions on the programming environment with additional libraries, templates, and utilities. DevPaks often contain, but are not limited to, GUI utilities, including popular toolkits such as GTK+, wxWidgets, and FLTK. Other DevPaks include libraries for more advanced function use. Users of Dev-C++ can download additional libraries, or packages of code that increase the scope and functionality of Dev-C++, such as graphics, compression, animation, sound support and many more. Users can create Devpaks and host them for free on the site. Also, they are not limited to use with Dev-C++ - the site says 'A typical devpak will work with any MinGW distribution (with any IDE for MinGW)'.

Development status[edit]

From February 22, 2005 to June 2011 the project was not noticeably active, with no news posted nor any updated versions released. In a 2006 forum post, lead developer Colin Laplace stated that he was busy with real-life issues and did not have time to continue development of Dev-C++.[2]

There are two forks of Dev-C++ since then: wxDev-C++ and the Orwell version.

All in all, it has the latest features. You can use its mugs so easily. Little snitch tutorial. Moreover, it is a tool that you use ever.

wxDev-C++ is a development team that has taken Dev-C++ and added new features such as support for multiple compilers and a RAD designer for wxWidgets applications.

On June 30, 2011 an unofficial version 4.9.9.3 of Dev-C++ was released by Orwell (Johan Mes), an independent programmer,[3] featuring the more recent GCC 4.5.2 compiler, Windows' SDK resources (Win32 and D3D), numerous bugfixes, and improved stability. On August 27, after five years of officially being in a beta stage, version 5.0 was released.[4] This version also has its own separate SourceForge[5] page since version 5.0.0.5, because the old developer isn't responding to combining requests. On July 2014, Orwell Dev-C++ 5.7.1 was released featuring the more recent GCC 4.8.1 which supports C++11.

Notable uses[edit]

On May 4, 2015, The Singapore Prime Minister Lee Hsien Loong posted his Sudoku solver program in C++ on Facebook. In his screen shot, he's using Microsoft Windows and Dev-C++ as his IDE.[6]

See also[edit]

References[edit]

  1. ^'Bloodshed Software - Providing Free Software to the internet community'. bloodshed.net. Retrieved 8 September 2015.
  2. ^'Dev-C++'. sourceforge.net. Retrieved 8 September 2015.
  3. ^Orwell. 'Dev-C++ Blog'. orwelldevcpp.blogspot.com. Retrieved 8 September 2015.
  4. ^Orwell. 'Dev-C++ Blog'. orwelldevcpp.blogspot.com. Retrieved 8 September 2015.
  5. ^orwelldevcpp. 'Dev-C++'. SourceForge. Retrieved 8 September 2015.
  6. ^'Prime Minister of Singapore shares his C++ code for Sudoku solver'. Ars Technica. Retrieved 8 September 2015.

External links[edit]

  • Official website
  • Dev-C++ on SourceForge.net
  • Dev-C++ Portable on SourceForge.net
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Dev-C%2B%2B&oldid=903610498'
The example programs of the previous sections provided little interaction with the user, if any at all. They simply printed simple values on screen, but the standard library provides many additional ways to interact with the user via its input/output features. This section will present a short introduction to some of the most useful.
C++ uses a convenient abstraction called streams to perform input and output operations in sequential media such as the screen, the keyboard or a file. A stream is an entity where a program can either insert or extract characters to/from. There is no need to know details about the media associated to the stream or any of its internal specifications. All we need to know is that streams are a source/destination of characters, and that these characters are provided/accepted sequentially (i.e., one after another).

Cin.get Not Working Dev C++


The standard library defines a handful of stream objects that can be used to access what are considered the standard sources and destinations of characters by the environment where the program runs:
Cin dev c download
streamdescription
cinstandard input stream
coutstandard output stream
cerrstandard error (output) stream
clogstandard logging (output) stream

We are going to see in more detail only cout and cin (the standard output and input streams); cerr and clog are also output streams, so they essentially work like cout, with the only difference being that they identify streams for specific purposes: error messages and logging; which, in many cases, in most environment setups, they actually do the exact same thing: they print on screen, although they can also be individually redirected.

Standard output (cout)

On most program environments, the standard output by default is the screen, and the C++ stream object defined to access it is cout.
For formatted output operations, cout is used together with the insertion operator, which is written as << (i.e., two 'less than' signs).
The << operator inserts the data that follows it into the stream that precedes it. In the examples above, it inserted the literal string Output sentence, the number 120, and the value of variable x into the standard output stream cout. Notice that the sentence in the first statement is enclosed in double quotes (') because it is a string literal, while in the last one, x is not. The double quoting is what makes the difference; when the text is enclosed between them, the text is printed literally; when they are not, the text is interpreted as the identifier of a variable, and its value is printed instead. For example, these two sentences have very different results:

Multiple insertion operations (<<) may be chained in a single statement:
This last statement would print the text This is a single C++ statement. Chaining insertions is especially useful to mix literals and variables in a single statement:

Assuming the age variable contains the value 24 and the zipcode variable contains 90064, the output of the previous statement would be:
I am 24 years old and my zipcode is 90064
What cout does not do automatically is add line breaks at the end, unless instructed to do so. For example, take the following two statements inserting into cout:
cout << 'This is a sentence.';
cout << 'This is another sentence.';
The output would be in a single line, without any line breaks in between. Something like:
This is a sentence.This is another sentence.
To insert a line break, a new-line character shall be inserted at the exact position the line should be broken. In C++, a new-line character can be specified as n (i.e., a backslash character followed by a lowercase n). For example:
This produces the following output:
First sentence.
Second sentence.
Third sentence.

Alternatively, the endl manipulator can also be used to break lines. For example:

This would print:
First sentence.
Second sentence.

The endl manipulator produces a newline character, exactly as the insertion of 'n' does; but it also has an additional behavior: the stream's buffer (if any) is flushed, which means that the output is requested to be physically written to the device, if it wasn't already. This affects mainly fully buffered streams, and cout is (generally) not a fully buffered stream. Still, it is generally a good idea to use endl only when flushing the stream would be a feature and 'n' when it would not. Bear in mind that a flushing operation incurs a certain overhead, and on some devices it may produce a delay.

Standard input (cin)

In most program environments, the standard input by default is the keyboard, and the C++ stream object defined to access it is cin.
For formatted input operations, cin is used together with the extraction operator, which is written as >> (i.e., two 'greater than' signs). This operator is then followed by the variable where the extracted data is stored. For example:
The first statement declares a variable of type int called age, and the second extracts from cin a value to be stored in it. This operation makes the program wait for input from cin; generally, this means that the program will wait for the user to enter some sequence with the keyboard. In this case, note that the characters introduced using the keyboard are only transmitted to the program when the ENTER (or RETURN) key is pressed. Once the statement with the extraction operation on cin is reached, the program will wait for as long as needed until some input is introduced.
The extraction operation on cin uses the type of the variable after the >> operator to determine how it interprets the characters read from the input; if it is an integer, the format expected is a series of digits, if a string a sequence of characters, etc.

As you can see, extracting from cin seems to make the task of getting input from the standard input pretty simple and straightforward. But this method also has a big drawback. What happens in the example above if the user enters something else that cannot be interpreted as an integer? Well, in this case, the extraction operation fails. And this, by default, lets the program continue without setting a value for variable i, producing undetermined results if the value of i is used later.
This is very poor program behavior. Most programs are expected to behave in an expected manner no matter what the user types, handling invalid values appropriately. Only very simple programs should rely on values extracted directly from cin without further checking. A little later we will see how stringstreams can be used to have better control over user input.
Extractions on cin can also be chained to request more than one datum in a single statement:
This is equivalent to:

In both cases, the user is expected to introduce two values, one for variable a, and another for variable b. Any kind of space is used to separate two consecutive input operations; this may either be a space, a tab, or a new-line character.

Dev C++ 5.11


cin and strings

The extraction operator can be used on cin to get strings of characters in the same way as with fundamental data types:
However, cin extraction always considers spaces (whitespaces, tabs, new-line..) as terminating the value being extracted, and thus extracting a string means to always extract a single word, not a phrase or an entire sentence.
To get an entire line from cin, there exists a function, called getline, that takes the stream (cin) as first argument, and the string variable as second. For example:

Notice how in both calls to getline, we used the same string identifier (mystr). What the program does in the second call is simply replace the previous content with the new one that is introduced.
The standard behavior that most users expect from a console program is that each time the program queries the user for input, the user introduces the field, and then presses ENTER (or RETURN). That is to say, input is generally expected to happen in terms of lines on console programs, and this can be achieved by using getline to obtain input from the user. Therefore, unless you have a strong reason not to, you should always use getline to get input in your console programs instead of extracting from cin.

stringstream

The standard header '><sstream> defines a type called stringstream that allows a string to be treated as a stream, and thus allowing extraction or insertion operations from/to strings in the same way as they are performed on cin and cout. This feature is most useful to convert strings to numerical values and vice versa. For example, in order to extract an integer from a string we can write:
This declares a string with initialized to a value of '1204', and a variable of type int. Then, the third line uses this variable to extract from a stringstream constructed from the string. This piece of code stores the numerical value 1204 in the variable called myint.

In this example, we acquire numeric values from the standard input indirectly: Instead of extracting numeric values directly from cin, we get lines from it into a string object (mystr), and then we extract the values from this string into the variables price and quantity. Once these are numerical values, arithmetic operations can be performed on them, such as multiplying them to obtain a total price.
With this approach of getting entire lines and extracting their contents, we separate the process of getting user input from its interpretation as data, allowing the input process to be what the user expects, and at the same time gaining more control over the transformation of its content into useful data by the program.

C++ Cin Example

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