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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 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 12 : Pointer comparison, increment decrement , precedence level of pointer, pointer comparison , pointer to pointer, pointer to structure , pointer initialization, accessing elements in C programming language

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Lecture 12 Pointer comparison, increment decrement , precedence level of pointer, pointer comparison , pointer to pointer, pointer to structure , pointer initialization, accessing elements in C programming language POINTER A pointer is a variable that store memory address or that contains address of another variable where addresses are the location number always contains whole number. So, pointer contain always the whole number. It is called pointer because it points to a particular location in memory by storing address of that location. Syntax - Data type *pointer name; Here * before pointer indicate the compiler that variable declared as a pointer.  e.g. int *p1; //pointer to integer type  float *p2; //pointer to float type  char *p3; //pointer to character type When pointer declared, it contains garbage value i.e. it may point any value in the memory. Two operators are used in the pointer i.e. address operator(&) and indirection operator or dereference operato...
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