5.

 #include<stdio.h>

#include<conio.h>

#include<process.h>

#define MAX_SIZE 4

int Q[MAX_SIZE], f = -1, r = -1;

void main()

{

int ch,x;

void QINSERT(int);

void QDELETE();

void QDISPLAY();

while(1)

 {

clrscr();

printf("\n 1.insert \n 2.delete \n 3.display \n 4.exit \n\n enter your choice \n\n");

scanf("%d",&ch);

switch(ch)

{

case 1:

printf("\n enter the element to be inserted into the queue \n\n");

scanf("%d",&x);

QINSERT(x);

break;

case 2:

QDELETE();

break;

case 3:

QDISPLAY();

break;

case 4:

printf("\n Bye!!! See you later \n");

getch();

exit(0);

default:

printf("\n Invalid choice... try again \n");

} /* end of switch */

 printf("\n\n press any key to continue........\n");

 getch();

 } /* end of while */

} /* end of main */

void QINSERT(int x)

{

if(r>=MAX_SIZE-1)

{

printf("\n queue overflow, insertion not possible \n");

return;

}

r++;

Q[r]=x;

if(f = = -1)

f = 0;

printf("\n element %d has been inserted into the queue \n",x);

}

void QDELETE()

{

int temp;

if(f = = -1)

{

printf("\n queue is empty, deletion not possible \n");

return;

}

temp=Q[f];

if(f = = r)

f = r = -1;

else

f++;

printf("\n deleted element from the queue is %d \n",temp);

}

void QDISPLAY()

{

int i;

if(f = = -1)

{

printf("\n queue is empty \n");

return;

}

printf("\n\n elements of the quere are \n\n");

for(i = f; i <= r; i++)

printf("%d\t",Q[i]);

}

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