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Introduction
What is C Identifiers Characters in C Datatypes & Variables Structure of C Program How to install turbo C in windows XP? How to install turbo C in windows 7/8?
Introduction [cont'd]
How to Compile and Run? Header files C Tokens Escape sequence Keywords Storage class specifier Constants
Introduction [cont'd]
Volatile
Operators
Operators Arithmetic Operators Relational operators Logical operators Increment & Decrement Operators Assignment Operators Bitwise operators
Operators [cont'd]
Conditional Operator Sizeof Operator
Input Output Functions
printf Scanf Getch putch getche Putchar getchar
Input Output Functions [cont'd]
gets puts
Decision Statements
If If-Else Else-If Nested If-Else Switch Goto
Looping Statements
For While Do-While Break Continue
Arrays
What is Array? One Dimensional Two Dimensional Multi Dimensional
Strings
What is String? Strlen Strcpy Strcmp Strlwr Strupr Strchr
Strings [cont'd]
Strstr Strcat Strrev
User-defined Functions
What is Functions? Function prototype Defining a Function Simple Arguments Return Value Arguments with Return value
User-defined Functions [cont'd]
Call by value Call by reference Recursion Nesting Functions Arrays as Arguments
Structures and Unions
Define Structure Copying Structures Comparing two Structures Arrays of Structures Nested Structures Structure with Functions Define Union
Structures and Unions [cont'd]
Different between Struct and Union
Pointers
Define Pointers & Operator Operators in pointers Pointers Array Pointers as Function Arguments Functions Returning Pointers Pointers and Structures
Memory
Dynamic Memory Allocation Malloc Calloc Realloc Free
Files
What is Files? Write Files Read Files Append Files Error handling
# Preprocessor
What is preprocessor in C? #include #define #if and #else #elif #ifdef #ifndef
# Preprocessor [cont'd]
#undef
Calloc in Memory of Programming in C
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Calloc 
Calloc is used to allocates space for an array of elements, initialize values as zero and returns the first address of allocated space to pointer variable.
Syntax 
(casttype *) calloc(no_of_records as int,size_of_datatype as int);
Program
	#include
	struct product{
	   int product_no;
	   char product_name[20];
	};
	void main(){
	   typedef struct product pro;
	   pro *product_ptr;
	   int i;
	   //Allocates the memory for structure variable using calloc
	   product_ptr = (pro *) calloc(5,sizeof(pro));
	   for (i=0;i<5;i++){
	       printf("Enter the product no : ");
	       scanf("%d",&(product_ptr+i)->product_no);
	       printf("Enter the product name : ");
	       scanf("%s",&(product_ptr+i)->product_name);
	   }
	   for (i=0;i<5;i++){
	       printf("%d : %s\n",(product_ptr+i)->product_no,(product_ptr+i)->product_name);
	   }
	}
Output 
Enter the product no : 101
Enter the product name : Hamam
Enter the product no : 102
Enter the product name : Liril
Enter the product no : 103
Enter the product name : Himalaya
Enter the product no : 104
Enter the product name : Colgate
Enter the product no : 105
Enter the product name : Lux

101 : Hamam
102 : Liril
103 : Himalaya
104 : Colgate
105 : Lux
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