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#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#define len sizeof(struct page)
struct pagetable
{
int pagenum;
int blocknum;
char state;
}num[1024];
struct page
{
int pagenum;
int blocknum;
struct page *next;
}*head=NULL,*tail=NULL;
int blocktable[3]={0,0,0};
void
print(int a)
{
int i;
printf("\n*****pagenum blocknum state\n");
for(i=0;i<=a;i++)
{
num[i].pagenum=i;
printf("%8d%8d%8c",num[i].pagenum,num[i].blocknum,num[i].state);
printf("\n");
}
printf("\n");
}
void
insert(int n,int m)
{
struct page*p;
p=(struct page*)malloc(len);
p->pagenum=n;
p->blocknum=m;
if(head==NULL)
{
head=p;
tail=p;
p->next=NULL;
}
else
{
tail->next=p;
tail=p;
}
}
int main( void )
{
int i,j,a,b,c,d;
char s;
char ch;
struct page *p;
/* #####Initialize pagetable!!!#####*/
printf("*****Please input the size of process:");
scanf("%d",&a);
b=a/1024;
for(i=0;i<=b;i++)
{
num[i].pagenum=i;
num[i].blocknum=-1;
num[i].state='F';
}
print(b);
/*#####Start to request the page!#####*/
do
{
ch=getchar(); //getch();
j=0;
printf("*****please input the adress:");
scanf("%d",&c);
if(c>a)
printf("\n*****The adress is slop over!\n");
else
{
d=c/1024;
s=num[d].state;
if(s=='T')
print(b);
else
{
for(j=0;j<3;j++)
if(blocktable[j]==0)
{
blocktable[j]=1;
num[d].pagenum=d;
num[d].blocknum=j;
num[d].state='T';
print(b);
insert(d,j);
break;
}
/*#####Start FIFO arithmetic!!!#####*/
if(j==3)
{
int h;
h=head->pagenum;
num[d].blocknum=head->blocknum;
num[d].state='T';
num[h].blocknum=-1;
num[h].state='F';
print(b);
p=(struct page*)malloc(len);
p->pagenum=d;
p->blocknum=head->blocknum;
p->next=NULL;
head=head->next;
tail->next=p;
tail=p;
}
}
}
}while(c>=0);
return 0;
}