BCA 2nd Sem Notes - Implementation without using standard library function

• UNIT-I (Array)

Definition

Declaration & initialization of 1D 

Accessing array elements

Displaying array elements

Sorting arrays

Arrays and function

Declaration & initialization of 1D

Accessing and Displaying

Memory representation of array [Row Major, Column Major]

Multidimensional array

UNIT-II (Pointers)

Definition

Declaration & initialization

Indirection operator

address of operator

pointer arithmetic

dynamic memory allocation

arrays and pointers

function and pointers

UNIT-III (Strings)

Definition

Declaration & initialization

standard library            function strlen()

  strlen(),strcpy(),       strcat() ,strcmp()

Implementation without using standard library functions

UNIT-IV (Structures)

Definition

Declaration & initialization

Accessing fields

structure operations

Nested structures

Union: Definition  declaration

Differentiate between Union and structure

UNIT-V                                     (C Pre-processor)

Definition
Macro substitution directives
File inclusion directives
Conditional compilation
Bitwise Operators
Shift operators
Masks
Bitfield

UNIT-VI                                (File Handling)

Definition of Files,
Opening modes of files
Standard function
fopen(), fclose(),             feof()  fseek(),                    fewind()
Using text files
fgetc(), fputc(), fscanf()

 Implementation without using standard library function 

 find the length of the string using given library function, but in this program, we are finding the length of the string without using library function

#include<stdio.h>
 int main() 
{   
char str[100]; 
  int length;  
  printf("\nEnter the String : ");  
gets(str);    length = 0;  // Initial Length    
while (str[length] != '\0')      
length++;    printf("\nLength of the String is : %d", length);
   return(0);
}
Explanation of Program :

printf("\nEnter the String : ");gets(str);

After that we have initialized the length variable with zero. “length” variable is used to keep track of the number of character accessed

length = 0;  // Initial Length
The initial length is 0. Now we are accessing very first character. If it is equal to NULL then we are terminating the loop else we are incrementing the length.

while (str[length] != '\0')      

length++;

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