C2007-09-26
File read and write - sample program in C
The objective of this tutorial to write a program that accesses a file that is not already connected to the program. One program that illustrates the need for such operations is ca
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C2007-09-26
scanf and sscanf sample program in C
scanf reads characters from the standard input, interprets them according to the specification in format, and stores the results through the remaining arguments. The format argumen
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Variable-length Argument Lists sample program in C
This tutorial contains an implementation of a minimal version of printf, to show how to write a function that processes a variable-length argument list in a portable way. Since we
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Using printf function in C
The output function printf translates internal values to characters. We have used printf informally in previous chapters. The description here covers most typical uses but is not c
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Standard Input and Output in C
The C library implements a simple model of text input and output. A text stream consists of a sequence of lines; each line ends with a newline character. If the system doesn't oper
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Using Bit-field in C
When storage space is at a premium, it may be necessary to pack several objects into a single machine word; one common use is a set of single-bit flags in applications like compile
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C2007-09-26
union example program in C
A union is a variable that may hold (at different times) objects of different types and sizes, with the compiler keeping track of size and alignment requirements. Unions provide a
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typedef example program in C
Notice that the type being declared in a typedef appears in the position of a variable name, not right after the word typedef. Syntactically, typedef is like the storage classes ex
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Table Lookup - hashtab - example program in C
In this tutorial we will write the innards of a table-lookup package, to illustrate more aspects of structures. This code is typical of what might be found in the symbol table mana
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Binary Tree - (Self-referential Structures) example program in C
One solution is to keep the set of words seen so far sorted at all times, by placing each word into its proper position in the order as it arrives. This shouldn't be done by shifti
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Pointers to Structures example program in C
To illustrate some of the considerations involved with pointers to and arrays of structures, let us write the keyword-counting program using pointers instead of array indices.
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Arrays of Structures example program in C
Consider writing a program to count the occurrences of each C keyword. We need an array of character strings to hold the names, and an array of integers for the counts. One possibi
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