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1.Optimal.c
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1.Optimal.c
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#include<stdio.h>
#define Frame_number 3
int Optimal(int pages[],int sz)
{
int frames[sz];
for(int i=0;i<sz;i++)frames[i]=-1;
int page_fault=0;
int victim=0;
for(int i=0;i<sz;i++){
int isFound=0;
for(int ii=0;ii<Frame_number;ii++){
if(frames[ii]==pages[i]){
isFound=1;
break;
}
}
if(!isFound){
int has_free_space=0;
for(int iii=0;iii<Frame_number;iii++){
if(frames[iii]==-1){
has_free_space=1;
frames[iii]=pages[i];
page_fault++;
break;
}
}
if(!has_free_space){
int nextUse[Frame_number];
for(int j=0;j<Frame_number;j++){
nextUse[j]=sz+1;
}
for(int j=0;j<Frame_number;j++){
for(int jj=i+1;jj<sz;jj++){
if(pages[jj]==frames[j]){
nextUse[j]=jj;
break;
}
}
}
int victim=0;
for(int j=0;j<Frame_number;j++){
if(nextUse[j]>nextUse[victim]){
victim=j;
}
}
frames[victim]=pages[i];
page_fault++;
}
}
}
return page_fault;
}
int main()
{
int pages[]={6,7,8,9,6,7,1,6,7,8,9,1,7,9,6};
int sz=sizeof(pages)/sizeof(pages[0]);
printf("\n Number of page Fault = %d\n",Optimal(pages,sz));
return 0;
}