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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 13 : Size of Structure in, array vs structure, array within structure , passing structure to function, Nested Structure , Union , nesting of unions

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Lecture 13 Size of Structure in, array vs structure, array within structure , passing structure to function, Nested Structure , Union , nesting of unions Size of structure - Size of structure can be found out using sizeof() operator with structure variable name or tag name with keyword. sizeof(struct student); or  sizeof(s1);  sizeof(s2); Size of structure is different in different machines. So size of whole structure may not be equal to sum of size of its members. Array of structures When database of any element is used in huge amount, we prefer Array of structures. Example:  suppose we want to maintain data base of 200 students, Array of structures is used.  #include<stdio.h>  #include<string.h>  struct student { char name[30];  char branch[25];  int roll; } void main() { struct student s[200];  int i; s[i].roll=i+1; printf("\nEnter information of students:");  for(i=0;i<200;i++) { printf("\nEnter the roll no:%d\n",s[...
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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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