#include<stdio.h> #include<stdlib.h> void push(int S[],int item); void pop(int S[]); void displayStack(int S[]); int top = -1,s_max; int main(void) { int choice,item; printf("\nEnter the Size of the stack : "); scanf("%d",&s_max); int S[s_max]; while(1) { printf("\nEnter the operations choice\n1.Push\n2.Pop\n3.Display Stack\n4.Exit\n\n"); scanf("%d",&choice); switch(choice) { case 1 :printf("\nEnter the element to push into the stack : "); scanf("%d", &item); push(S,item); //displayStack(S); break; case 2 : pop(S); //displayStack(S); break; case 3 : displayStack(S); break; case 4 : exit(0); default:printf("\n\nYou have entered wrong choice !\n\n"); } } return 0; } void push(int S[],int item) { if(top == s_max-1) printf("\n Overflow Error : Stack is full you can't enter any more element.\n"); else { top=top+1; S[top]=item; } } void pop(int S[]) { if(top == -1) printf("\n Underflow Error : Stack is Empty you can't delete any more element.\n"); else { top = top-1; S[top+1]; printf("\n%d is poped!\n", S[top+1]); } } void displayStack(int S[]) { int i; if(top == -1) printf("\nStack is Empty |__| !\n"); else for(i=top; i>=0; i--) { printf("\t%d\n",S[i]); } }Output :
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Wednesday 5 March 2014
Stack implementation using arrays
Queue Implementation using arrays
#include<stdio.h>
#include<stdlib.h>
#define MAX 4 //you can increase or decrease the
//queue size by modifying MAX value
void Enqueue(int Q[], int item);
void Dequeue(int Q[]);
void display_Q(int Q[]);
int Front=-1,Rear=-1;
int main(void)
{
int item,choice;
int Q[MAX];
while(1)
{
printf("\n1.Insert an item into Q\n2.Delete an item from Q"
"\n3.Display Queue\n4.Exit\n\nEnter the choice as given : ");
scanf("%d",&choice);
switch(choice)
{
case 1:printf("\nEnter the element : ");
scanf("%d",&item);
Enqueue(Q,item);
break;
case 2:Dequeue(Q);
break;
case 3:display_Q(Q);
break;
case 4:exit(0);
break;
default: printf("\n\nYou have entered wrong choice !\n\n");
}
}
return 0;
}
void Enqueue(int Q[], int item)
{
if(Rear == MAX-1)
{
if(Front == 0)
printf("\nQueue is full, you can't enter any more elemetns !\n\n");
else
printf("\nYou can't insert untill queue will not be empty !\n");
}
else
{
Rear++;
Q[Rear]= item;
if(Front==-1)
Front = 0;
}
}
void Dequeue(int Q[])
{
int x;
if(Front == -1)
printf("\nQueue is Empty, you can't delete any more element !\n\n");
else
{
x = Q[Front];
Front++;
if(Front == Rear+1)
{
Front = -1;
Rear = -1;
}
printf("\n%d is deleted form Queue !\n",x);
}
}
void display_Q(int Q[])
{
int i;
if(Front == -1)
printf("\nQueue is Empty !\n\n");
else
for(i=Front; i<=Rear; i++)
printf(" %d",Q[i]);
}
//Note => once you started deletion You can't insert another
//element in queue untill the queue is empty.
//cause it is array implementation and it is also not a circular queue
Output:
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