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C Programming Code Examples

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Display the size of a file in C

/* Display the size of a file in C */ #include <stdio.h> #include <io.h> #include <fcntl.h> #include <sys\stat.h> int main() { int fp; long file_size; if ((fp = open("f:/cprojects/urls.txt", O_RDONLY)) == -1) printf("Error opening the file \n"); else { file_size = filelength(file_handle); printf("The file size in bytes is %ld\n", file_size); close(fp); } return 0; }

#include is a way of including a standard or user-defined file in the program and is mostly written at the beginning of any C/C++ program. This directive is read by the preprocessor and orders it to insert the content of a user-defined or system header file into the following program. These files are mainly imported from an outside source into the current program. The process of importing such files that might be system-defined or user-defined is known as File Inclusion. This type of preprocessor directive tells the compiler to include a file in the source code program. Here are the two types of file that can be included using #include:

filelength() returns the length, in bytes, of the file associated with 'filedes'. Returns the number of bytes in an open file. The filelength() function returns the number of bytes in the opened file indicated by the file descriptor filedes.

Writes the C string pointed by format to the standard output (stdout). If format includes format specifiers (subsequences beginning with %), the additional arguments following format are formatted and inserted in the resulting string replacing their respective specifiers. printf format string refers to a control parameter used by a class of functions in the input/output libraries of C programming language. The string is written in a simple template language: characters are usually copied literally into the function's output, but format specifiers, which start with a % character, indicate the location and method to translate a piece of data (such as a number) to characters. "printf" is the name of one of the main C output functions, and stands for "print formatted". printf format strings are complementary to scanf format strings, which provide formatted input (parsing). In both cases these provide simple functionality and fixed format compared to more sophisticated and flexible template engines or parsers,

The if-else statement is used to perform two operations for a single condition. The if-else statement is an extension to the if statement using which, we can perform two different operations, i.e., one is for the correctness of that condition, and the other is for the incorrectness of the condition. Here, we must notice that if and else block cannot be executed simiulteneously. Using if-else statement is always preferable since it always invokes an otherwise case with every if condition.

Closes a file descriptor, fildes. This frees the file descriptor to be returned by future open() calls and other calls that create file descriptors. The fildes argument must represent a hierarchical file system (HFS) file. When the last open file descriptor for a file is closed, the file itself is closed. If the file's link count is 0 at that time, its space is freed and the file becomes inaccessible. When the last open file descriptor for a pipe or FIFO file is closed, any data remaining in the pipe or FIFO file is discarded. close() unlocks (removes) all outstanding record locks that a process has on the associated file. Behavior for sockets: close() call shuts down the socket associated with the socket descriptor socket, and frees resources allocated to the socket. If socket refers to an open TCP connection, the connection is closed. If a stream socket is closed when there is input data queued, the TCP connection is reset rather than being cleanly closed.

The open() function shall establish the connection between a file and a file descriptor. It shall create an open file description that refers to a file and a file descriptor that refers to that open file description. The file descriptor is used by other I/O functions to refer to that file. The path argument points to a pathname naming the file. The open() function shall return a file descriptor for the named file that is the lowest file descriptor not currently open for that process. The open file description is new, and therefore the file descriptor shall not share it with any other process in the system. The FD_CLOEXEC file descriptor flag associated with the new file descriptor shall be cleared.

In C, the "main" function is treated the same as every function, it has a return type (and in some cases accepts inputs via parameters). The only difference is that the main function is "called" by the operating system when the user runs the program. Thus the main function is always the first code executed when a program starts. main() function is a user defined, body of the function is defined by the programmer or we can say main() is programmer/user implemented function, whose prototype is predefined in the compiler. Hence we can say that main() in c programming is user defined as well as predefined because it's prototype is predefined. main() is a system (compiler) declared function whose defined by the user, which is invoked automatically by the operating system when program is being executed.




The following 'C Language Program' to using recursion, finds whether the entered number is a prime number or not. A 'prime number' is integer that has no integral factor but itself &

Input number from user and check whether the number is even or odd using switch case. A number is said even number if it is exactly divisible by 2. In C we use Modulo operator...


C program example to learn reference enum value by int. Press a key to select animal: 1: cat, 2: dog, 3: lion, 4: tiger. Generate a new random number. Read and discard character.


C Language program Find 'LCM' of a Number using Recursion. The following C Program to use recursion, finds the 'LCM'. An 'LCM' is the 'Lowest Common Multiple' of any 2 numbers.

Two stacks to store two ends of the list in C. Entering elements in the array. Set top to stack. To print the sorted array. Enter the no of elements in the array. Enter the elements