Time waits for no one

<ctype.h> - Contains functions used to classify characters by their types or to convert between upper and lower case in a way that is independent of the used character set (typically ASCII or one of its extensions, although implementations utilizing EBCDIC are also known).

<errno.h> - For testing error codes reported by library functions.

<fenv.h> - For controlling floating-point environment. (New with C99)

<float.h> - Contains defined constants specifying the implementation-specific properties of the floating-point library, such as the minimum difference between two different floating-point numbers (_EPSILON), the maximum number of digits of accuracy (_DIG) and the range of numbers which can be represented (_MIN, _MAX).

<inttypes.h> - For precise conversion between integer types. (New with C99)

<iso646.h> - For programming in ISO 646 variant character sets. (New with NA1)

<limits.h> - Contains defined constants specifying the implementation-specific properties of the integer types, such as the range of numbers which can be represented (_MIN, _MAX).

<locale.h> - For setlocale() and related constants. This is used to choose an appropriate locale.

<math.h> - For computing common mathematical functions

<setjmp.h> - Declares the macros setjmp and longjmp, which are used for non-local exits

<signal.h> - For controlling various exceptional conditions

<stdarg.h> - For accessing a varying number of arguments passed to functions.

<stdbool.h> - For a boolean data type. (New with C99) For a boolean data type. (New with C99)

<stdint.h> - For defining various integer types. (New with C99)

<stddef.h> - For defining several useful types and macros.

<stdio.h> - Provides the core input and output capabilities of the C language. This file includes the venerable printf function.

<stdlib.h> - For performing a variety of operations, including conversion, pseudo-random numbers, memory allocation, process control, environment, signalling, searching, and sorting.

<string.h> - For manipulating several kinds of strings.

<tgmath.h> - For type-generic mathematical functions. (New with C99)

<time.h> - For converting between various time and date formats.

<wchar.h> - For manipulating wide streams and several kinds of strings using wide characters - key to supporting a range of languages. (New with NA1)

<wctype.h> - For classifying wide characters. (New with NA1)

Difference between Data and Information

Data

Is a collection of facts from which conclusions may be drawn. When information is entered into and stored in a computer, it is generally referred to as data. Data is produced after gathering information. Data can also mean “pieces of information that represent the qualitative or quantitative attributes of a variable or set of variables”. In computer terms, data is information converted into binary digital form.

Information

Means “knowledge acquired through study or experience or instruction”. Information is a stimulus that has meaning in some context for its receiver. After processing (such as formatting and printing), output data can again be perceived as information. The English word was apparently derived from the Latin accusative form (informationem) of the nominative (informatio): this noun is on its turn derived from the verb “informare” (to inform) in the sense of “to give form to the mind”, “to discipline”, “instruct”, “teach”.

Example:

When knowledge of person A is passed on to person B, person B gained information from person A.

Difference between Constants and Variables

Constants

Variables

4.)Backslash Codes

\n -

\o -5.) Flowchart Symbols - meaning

1.)

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June 25, 2009