Standard Library Functions

By -




According to wikipedia ...


Standard stands for a level of quality or attainment.      

Library stand for collection of book.

Function is an activity that is for a purpose of a person or thing.




Therefore The Standard Library Functions are defined as  ...

"Standard Library are the collection of subprograms (function) which is used to develop other programs or software."


♥ Types of Functions

 1- Library Functions  (Header Files function)                         //In this post
2- User Defined Function (User Defined Functions)               // In next post



♣ Character Functions

Character Functions, are the collection of all the function related with characters. The header file is "ctype.h" is used to use following functions.


# isalnum() -

is - " Is " is used to form question.
al-   al stands " alphabet " .
num- num stands for " number " .

Isalnum() is a function, which is defined in ctype.h and it is used to check whether the given or entered character is alphabet or number.  


# isalpha() -

is - " Is " is used to form question.
alpha  - alpha stands " alphabet "

 Isalpha() is a function, which is defined in ctype.h and it is used to check whether the given or entered character is alphabet or not.


# isdigit() -

is - " Is " is used to form question.
digit  - digit stands " digit " .

Isdigit() is a function, which is defined in ctype.h and it is used to check whether the given or entered character is digit or not.


# islower() -

is - " Is " is used to form question.
lower  - lower stands " small alphabet " .

Islower() is a function, which is defined in ctype.h and it is used to check whether the given or entered character is lowercase or not.


# isupper() - 

is - " Is " is used to form question.
upper  - lower stands " small alphabet " .

Isupper() is a function, which is defined in ctype.h and it is used to check whether the given or entered character is upper case or not.
# toupper() - 

to - " to " is used to perform task.
upper  - upper stands " capital alphabet " .

toupper() is a function, which is defined in ctype.h and it is used to convert all characters (alphabet) into upper case .


# tolower() - 

to - " to " is used to perform task.
lower  - upper stands " capital alphabet " .

tolower() is a function, which is defined in ctype.h and it is used to convert all characters (alphabet) into lower case .
♣ String Functions

String Functions is used in a string (array of characters) which help to modify string according to need.The header file is "string.h" is used to use following functions.


# strcat() -

str - stands for string.
cat - stands for concatenation.

 strcat() function is used to concatenate two or more strings together. The header file which is used  to invoke strcat() function is string.h .


# strcmp() -

str - stands for string.
cmp - stands for compare.

strcmp() function is used to compare two strings together. The header file which is used  to invoke strcmp() function is string.h .


# strcpy() -

str - stands for string.
cpy - stands for copy.

strcpy() function is used to copy from one to another. The header file which is used  to invoke strpy() function is string.h .

# strlen() -

str - stands for string.
len - stands for length.

strlen() function is used to return length of the given string. The header file which is used  to invoke strlen() function is string.h .




♣ Mathematical Functions

These functions is used in maths operations.The header file is "math.h" is used to use following functions.


# fabs() -

f - f stands for floating point number
abs - absolute numbers

It gives the absolute value of given floating point number.


# abs() -  It gives the absolute value of given integer number. It is also defined in stdio.h header file.


# log() - This function return natural log of the given argument.


 # log10() - This function return log  base 10 value of the given argument.


# pow() - This function returns power of the x raise to power y.


# sqrt() - This function returns square root of the given argument.
# sin() - The function returns sine function of the given argument  and the argument must be in radian.


# cos() - The function returns cosine function of the given argument and the argument must be in radian. 




♣ Other functions 
# randomize() - This function provide random seed to the random function.


# random() - This function is used to generate any number between 0 to (n-1) when n is the argument or a given number

 Note- Both functions used together.






By - Somesh Sah




Comments

Post a Comment

Popular posts from this blog

Include Vs Import

By -
Image
There are two terms IMPORT and INCLUDE ,  In C and C++ Programs ,  Include Statement is used #include directive makes the compiler go to the C/C++ standard library  It copy the code from the header files into the program.  The whole include file code will copy into the program  As a result, the program size increases wasting memory and processor’s time.  In Java Programs , Import  Statement is used import statement makes the JVM(Java Virtual Machine) go to the Java standard library, execute the code there ,  and substitute the result into the program.  Hence, no code is copied hence no waste of memory and processor’s time. Hence import is more efficient mechanism than #include. By - Somesh Sah
Read more

Object Oriented Program (Paradigm)

By -
Image
Paradigm - It is a mythology and implementation of the program. (It is a way of programming) Therefore, There are three ways (Style) to write a program - ♣ Procedural Programming  ♣ Object Based Programming ♣ Object Oriented Programming  Procedural Programming -  ☻ Importance is given to the procedural (Function and Methods) ☻ Data is secondary ( data moves openly) ☻ It follows Top-Down Designing. Example - Basic and C  Object Based Programming - ☻ These languages support Classes  ☻ These languages does not support Inheritance and Polymorphism    Example - ada Object Oriented Programming - ☻ These language support all the mentioned features Encapsulation Abstraction Polymorphism Inheritance ☻ Data is hidden ☻ It follows bottom up design  Example - C++ , Java etc. Now, Object Oriented Programming (OOP's) in detail  DEFINITION OF OOPs " O...
Read more

Operators and Expressions

By -
Image
Definition " Operators are the symbols which performs some operation on operands. " "  Expreation is any valid combination of operators, constants and variables. " Types of operators There are two types of operators      a) On the basis of type of operands                1- Unary operator               2- Binary operator               3- Ternary operator       b) On the basis of type operation performed                1- Arithmetic operator               2- Logical operator               3- Relational operator               4- Bit wise operator               5- Assignment operator...
Read more