Insert function, Data Structure & Algorithms

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INSERT FUNCTION

/*prototypes of insert & find functions */

list * insert_list(list *);

list * find(list *, int);

/*definition of  anyinsert function */

list * insert_list(list *start)

{

list *n, *f;

int key, element;

printf("enter value of new element");

scanf("%d", &element);

printf("enter value of key element");

scanf("%d",&key);

if(start->data ==key)

{

n=(list *)mallo(sizeof(list));

n->data=element; n->next = start; start=n;

}

else

{

f = find(start, key);

if(f == NULL)

printf("\n key is not found \n");

else

{

n=(list*)malloc(sizeof(list));

n->data=element; n->next=f->next; f->next=n;

}

}

return(start);

}

/*definition of a find function */

list * find(list *start, int key)

{

if(start->next->data == key)

return(start);

if(start->next->next == NULL)

return(NULL);

else

find(start->next, key);

}

void main()

{

list  *head;

void create(list *);

int count(list *);

void traverse(list *);

head=(list *)malloc(sizeof(list));

create(head);

printf(" \ntraversing the list \n");

traverse(head);

printf("\n number of elements in the list   %d \n", count(head));

head=insert_list(head);

printf(" \nafter the insertion of new elementstraverse list \n");

traverse(head);

}

Program: Insertion of an element in a linked list at a particular position


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