C Program for Stack using linked list

Program:-

//C Program for Stack using linked list

#include<stdio.h>

#include<stdlib.h>

struct link

{

int info;

struct link * next;

};

struct link * start=NULL;

void insert();

void show();

void del();

void main()

{

int ch,temp;

do

{

printf("\n\t Main menu");

printf("\n 1:insert");

printf("\n 2:delete");

printf("\n 3:Show");

printf("\n 4:Exit");

printf("\n Enter Your Choice ");

scanf("%d",&ch);

switch(ch)

{

case 1: insert(); break;

case 2: del(); break;

case 3: show(); break;

case 4: temp=1; break;

default: printf("\n wrong choice");

}

}while(ch!=4 && temp!=1);

}

void insert()

{

struct link * temp,* move;

int num;

temp=(struct link *)malloc(sizeof(struct link));

printf("Enter the number\n");

scanf("%d",&num);

temp->info=num;

temp->next=NULL;

if(start==NULL)

start=temp;

else

{

move=start;

while(move->next!=NULL)

{

move=move->next;

}

move->next=temp;

}

}

void del()

{

struct link * back,* move;

int item;

if(start==NULL)

printf("link list is empty");

else

{

move=start;

if(move->next==NULL)

{

item=move->info;

start=NULL;

}

else

{

while(move->next!=NULL)

{

back=move;

move=move->next;

}

item=move->info;

back->next=NULL;

}

printf("item deleted=%d",item);

}

}

void show()

{

struct link * temp,* move;

if(start==NULL)

printf("list is empty");

else

{

move=start;

printf("Elements are ");

while(move->next!=NULL)

{

printf("%d\n",move->info);

move=move->next;

}

printf("%d\n",move->info);

}

}

Output:-



Main menu
 1:insert
 2:delete
 3:Show
 4:Exit
 Enter Your Choice 1
Enter the number
10

Main menu
 1:insert
 2:delete
 3:Show
 4:Exit
 Enter Your Choice 1
Enter the number
20

Main menu
 1:insert
 2:delete
 3:Show
 4:Exit
 Enter Your Choice 1
Enter the number
30

Main menu
 1:insert
 2:delete
 3:Show
 4:Exit
 Enter Your Choice 3
Elements are 10
20
30

Main menu
 1:insert
 2:delete
 3:Show
 4:Exit
 Enter Your Choice 2
item deleted=30
Main menu
 1:insert
 2:delete
 3:Show
 4:Exit
 Enter Your Choice 3
Elements are 10
20

Main menu
 1:insert
 2:delete
 3:Show
 4:Exit

 Enter Your Choice 4