лабораторки по ОС препод Челноков / 2семестр / VD / NIck / lab32

#include <stdio.h>
#define dim 5
main()
{
int out,in;
int ch;
char q;
int m[dim];
int pnr=0;
int pnr2=0;
int push(int a)
	{
	if (pnr==dim) pnr=0;
	m[pnr]=a;
	pnr++;
	}
int pop()
	{
	if (pnr==pnr2)
		{
		printf("Error: queue overflow or empty queue\n");
		exit(1);
		}
	pnr2++;
	return(m[pnr2-1]);
	}
do
{printf("Enter '1' if you want take from queue, '2' if you want to put into queue:");
scanf("%d",&ch);
printf("\n");
if (ch==1)
	{
	out=pop();
	printf("Value is: %d\n",out);
	}
if (ch==2)
	{
	printf("Enter value:");
	scanf("%d",&in);
	printf("\n");
	push(in);
	}
if (ch!=1 && ch!=2)
	{
	printf("Error: bad argument\n");
	exit(2);
	}
printf("One more time? (Y/N):");
scanf("%s", &q);
printf("\n");
if ((q!='y') && (q!='Y') && (q!='n') && (q!='N'))
	{
	printf("Error: bad input\n");
	exit(3);
	}
}
while (q!='n' && q!='N');

}