File Input Output In Dev C++
C++ Syntax
Techniques oh how to format the input-output in C stream using C program examples and source codes includes iostream and fstream family. Connected to the standard input device, normally the keyboard. Object of ostream class. For file input/output operations. Table 18.4: File input/output. Saving Output to a File (Using Codeblocks or Dev-C) Saving Your Output to a File To save the output to a file, a. Right-click in the top bar of the output window and choose Edit Select All. To perform input and output, a C program: Construct a stream object. Connect (Associate) the stream object to an actual IO device (e.g., keyboard, console, file, network, another program). Perform input/output operations on the stream, via the functions defined in the stream's pubic interface in a device independent manner.
Let's break up the following code to understand it better:
Example
using namespace std;
int main() {
cout << 'Hello World!';
return 0;
}
Example explained
Line 1:#include <iostream> is a header file library that lets us work with input and output objects, such as cout (used in line 5). Header files add functionality to C++ programs.
Line 2:using namespace std means that we can use names for objects and variables from the standard library.
Don't worry if you don't understand how #include <iostream> and using namespace std works. Just think of it as something that (almost) always appears in your program.
Line 3: A blank line. C++ ignores white space.
Line 4: Another thing that always appear in a C++ program, is int main(). This is called a function. Any code inside its curly brackets {} will be executed.
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C++ Output To File
C++ File Input
Line 5:cout (pronounced 'see-out') is an object used together with the insertion operator (<<) to output/print text. In our example it will output 'Hello World'.
Note: Every C++ statement ends with a semicolon ;.
Note: The body of int main() could also been written as:int main () { cout << 'Hello World! '; return 0; }
Remember: The compiler ignores white spaces. However, multiple lines makes the code more readable.
Line 6:return 0 ends the main function.
Line 7: Do not forget to add the closing curly bracket } to actually end the main function.
C++ Input And Output Files
Omitting Namespace
You might see some C++ programs that runs without the standard namespace library. The using namespace std line can be omitted and replaced with the std keyword, followed by the :: operator for some objects:
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Example
int main() {
std::cout << 'Hello World!';
return 0;
}
It is up to you if you want to include the standard namespace library or not.