#include <stdio.h>
#define maxsize 50
int queue[maxsize],front=-1,rear=-1;
void push();
void pop();
void display();
int main(void) {
int ch,c=1;
while(1)
{
printf("\n1.Push");
printf("\n2.Pop");
printf("\n3.Display");
printf("\n4.Exit");
printf("\nEnter Your Choice:");
scanf("%d",&ch);
if(ch==4)
{
return 0;
}
switch(ch)
{
case 1:
push();
break;
case 2:
pop();
break;
case 3:
display();
break;
}
}
return 0;
}
void push()
{
int a;
printf("Enter value:");
scanf("%d",&a);
if(rear==maxsize-1)
{
printf("Overflow");
return;
}
rear++;
queue[rear]=a;
if(front==-1)
{
front=0;
}
return;
}
void pop()
{
int a;
if(front==-1)
{
printf("Queue Empty");
return;
}
printf("%d is deleted",queue[front]);
a=queue[front];
queue[front]=0;
if(front==rear)
{
front=rear=-1;
}
else
{
front++;
}
return;
}
void display()
{
int t;
if(front==-1)
{
printf("Queue is Empty");
}
else
{
printf("Queue elements are....\n");
for(t=front;t<=rear;t++)
{
printf("%d\t",queue[t]);
}
}
return;
}