C2007-10-03
Bitwise Logical Operators in C
Three bitwise logical operators are used to manipulate individual bits in an integer data type, as shown in Table below. These operators have names similar to the TRUE/FALSE logica
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C2007-10-03
Using Shift Operators in C
Two shift operators shift the bits in an integer variable by a specified number of positions. The > operator shifts bits to the right. The syntax for these binary operators is
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Using memset(), memcpy(), and memmove() in C
Use memset() to initialize a block of memory to a specified value. Because this function can use only a type char as the initialization value, it is not useful for working with blo
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Using free() Function in C
When you allocate memory with either malloc() or calloc(), it is taken from the dynamic memory pool that is available to your program. This pool is sometimes called the heap, and i
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Using realloc() Function in C
The realloc() function changes the size of a block of memory that was previously allocated with malloc() or calloc(). The function prototype is void *realloc(void *ptr, size_t size
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Using calloc() Function in C
The calloc() function also allocates memory. Rather than allocating a group of bytes as malloc() does, calloc() allocates a group of objects. The function prototype is void *calloc
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C2007-10-03
Using malloc() Function in C
The malloc() function isn't limited to allocating memory for strings, of course; it can allocate space for any storage need. This function allocates memory by the byte. Recall that
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A Storage Allocator sample program in C
In this tutorial let us write a storage allocator which is unrestricted. Calls to malloc and free may occur in any order; malloc calls upon the operating system to obtain more memo
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Listing Files and Directories sample program in C
A different kind of file system interaction is sometimes called for - determining information about a file, not what it contains. A directory-listing program such as the UNIX comma
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Fopen and Getc implementation program in C
Files in the standard library are described by file pointers rather than file descriptors. A file pointer is a pointer to a structure that contains several pieces of information ab
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lseek() sample program in C
Input and output are normally sequential: each read or write takes place at a position in the file right after the previous one. When necessary, however, a file can be read or writ
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Open, Creat, Close, Unlink system calls sample program in C
Other than the default standard input, output and error, you must explicitly open files in order to read or write them. There are two system calls for this, open and creat [sic].
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