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A file descriptor is a non-negative integer that uniquely identifies an open file or a socket in a process. It serves as a reference to access the file or socket for reading, writing, or other operations. Typically, file descriptors start from 0 for standard input, 1 for standard output, and 2 for standard error, with subsequent descriptors assigned to other open files or resources as needed.
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Why do you have to use the return type for the main function in c language i mean to what does the main function have to return the value to?
It returns the value to the operating system or whatever process launched it. If you launched your program from a batch file then the batch file can detect this return value. If your program is spawned or launched by another program then the return value goes to that parent prgoram or process. One more thing is that you can write main() without the return type and it will be absolutely correct
Why is it important to check the return status when opening a file in c plus plus?
The return value tells you if any errors occurred. A value of 0 typically indicates no error.
What data type does the main function return in c?
The main function must return the int data type. A program that terminates normally should return the value zero to indicate no error. Not all execution environments make use of the return value (Windows in particular), however a command script or batch file can examine the ERRORLEVEL if required.
Difference in using a method that return value and method that does not return value in object orinted programming?
A method that return a value should have a return statement. The method signature should indicate the type of return value. While in the case of a method that does not return a value should not have a return statement and in the signature, the return type is void. When using a method that doesn't return a value, a programmer can not get a value from that function, but instead, it can only change variable values and run other methods.
What is wrong with not writing a return statement in value-returning method in java?
It is a syntax error, because a value returning method must return a value, and not writing a return statement with a value is tantamount to returning without a value.
What is file descriptor?
In computer programming, a file descriptor (FD) is an abstract indicator for accessing a file. The term is generally used in POSIX operating systems.
What is the full form of mdf?
Media Descriptor File.
What is a breadcrumb trail on the computer?
a file path descriptor, showing your location in the file structure
What are the Unix system calls for Input and Output?
In Unix, the primary system calls for input and output are read(), write(), open(), close(), and lseek(). The open() call is used to open a file descriptor for reading or writing, while read() and write() perform the actual data transfer between the file descriptor and a buffer in memory. The close() call is used to close the file descriptor, and lseek() allows for repositioning the file pointer within the file. These calls provide a low-level interface for file and device I/O operations.
Why do you have to use the return type for the main function in c language i mean to what does the main function have to return the value to?
It returns the value to the operating system or whatever process launched it. If you launched your program from a batch file then the batch file can detect this return value. If your program is spawned or launched by another program then the return value goes to that parent prgoram or process. One more thing is that you can write main() without the return type and it will be absolutely correct
who has to file a return ?
Who has to file a return
Why is it important to check the return status when opening a file in c plus plus?
The return value tells you if any errors occurred. A value of 0 typically indicates no error.
What is the difference between fseek and lseek?
lseek is a system call, but fseek is a C function belonging to the ANSI C standard library, and included in the file stdio.h lseek uses file descriptor (return by open system call), but fseek uses pointer to FILE structure (return by fopen ANSI C library function) (though file desctor and FILE * can be used interchangeably several times). System calls are to communicate directly with an operating system. Generally, system calls are slower than normal function calls.
What is the full form of close?
CLOSE The close() function shall deallocate the file descriptor indicated by fieldesclose() closes a file descriptor, so that it no longer refers to any file and may be reused. Any record locksIf file is the last file descriptor referring to the underlying open file description the resources associated with the open file description are freed; if the descriptor was the last reference to a file which has been removed using unlink(2) the file is deleted.In mathematics, an expression is said to be a closed-form expression if it can be expressed analytically in terms of a bounded number of certain "well-known" functions. Typically, these well-known functions are defined to be elementary functions-constants, one variable x, elementary operations of arithmetic (+ − × ÷), nth roots, exponent and logarithm (which thus also include trigonometric functions and inverse trigonometric functions).CLOSE PRODUCTSCOMPUTER LITERACY OFFER SYSTEM ESTABLISHMENT.COMMON LANGUAGE OF SUPREME ESTATE
What is difference between child process and thread?
The child process is initially running its parent' s program, with its parent' s virtual memory, file descriptors, and so on copied.The child process can modify its memory, close file descriptors, and the like without affecting its parent, and vice versa. When a program creates another thread, though, nothing is copied.The creating and the created thread share the same memory space, file descriptors, and other system resources as the original. If one thread changes the value of a variable, for instance, the other thread subsequently will see the modified value. Similarly, if one thread closes a file descriptor, other threads may not read from or write to that file descriptor.
Will you need to pay estate taxes?
That will depend on the value of the estate. The executor will have to file a tax return with the IRS for the estate.
Do you have to file a tax return if you made 7000 dollars?
If you are being claimed as a dependent on your parents or anyone else's return then you will have to file a tax return. If not then no you don't have to file a return.
