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Lecture 11 : Local, Global and Static variable monolithic vs modular programming, Storage classes, storage class cont.., pointer in C programming language

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Lecture : 11 Local, Global and Static variable  Local variable:-   Variables that are defined with in a body of function or block. The local variables can be used only in that function or block in which they are declared.  Same variables may be used in different functions such as  function() { int a,b; function 1(); } function2 () { int a=0; b=20; } Global variable:-   the variables that are defined outside of the function is called global variable. All functions in the program can access and modify global variables. Global variables are automatically initialized at the time of initialization.  Example: #include<stdio.h>  void function(void);  void function1(void);  void function2(void);  int a, b=20; void main() { printf(“inside main a=%d,b=%d \n”,a,b); function(); function1(); function2(); } function() { Prinf(“inside function a=%d,b=%d\n”,a,b); } function 1() { prinf(“inside function a=%d,b=%d\n”,a,b); } function 2() { pri...
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Lecture - 10 : Function in C programming language

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Lecture - 10 Function in C programming language  FUNCTION   A function is a self contained block of codes or sub programs with a set of statements that perform some specific task or coherent task when it is called . It is something like to hiring a person to do some specific task like, every six months servicing a bike and hand over to it. Any ‘C’ program contain at least one function i.e main().  There are basically two types of function those are :         1. Library function         2. User defined function Pi The user defined functions defined by the user according to its requirement System defined function can’t be modified, it can only read and can be used. These function are supplied with every C compiler Source of these library function are pre complied and only object code get used by the user by linking to the code by linker Here in system defined function description: Function definition  : predefined, precompiled, s...
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Lecture 3: Character set, identifiers, keywords

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Lecture 3 Character set, identifiers, keywords Character set A character denotes any alphabet, digit or special symbol used to represent information. Valid alphabets, numbers and special symbols allowed in C are The alphabets, numbers and special symbols when properly combined form constants, variables and keywords. Identifiers : Identifiers are user defined word used to name of entities like variables, arrays, functions, structures etc.  Rules for naming identifiers are: 1) name should only consists of alphabets (both upper and lower case), digits and underscore (_) sign. 2) first characters should be alphabet or underscore 3) name should not be a keyword 4) since C is a case sensitive, the upper case and lower case considered differently, for example code, Code, CODE etc. are different identifiers. 5) identifiers are generally given in some meaningful name such as value, net_salary, age, data etc.  Note: An identifier name may be long, some implementation reco...
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