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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 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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Lecture - 7 : Control statement in C language ( if, else, else if, nested if)

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Lecture - 7 Control statement in C language if statement Statement execute set of command like when condition is true.  If (condition) Statement; The statement is executed only when condition is true. If the if statement body is consists of several statement then better to use pair of curly braces. Here in case condition is false then compiler skip the line within the if block. void main() { int n; printf (“ enter a number:”); scanf(“%d”,&n); If (n>10) Printf(“ number is grater”); } Output: Enter a number:12 Number is greater if…..else ... Statement It is bidirectional conditional control statement that contains one condition & two possible action. Condition may be true or false, where non-zero value regarded as true & zero value regarded as false. If condition are satisfy true, then a single or block of statement executed otherwise another single or block of statement is executed. Its syntax is:- if (condition) { Statement1; Statement2; } else { ...
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