FIFO PAGE REPLACEMENT : import java.io.*; public class FIFO {
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- Collin Gallagher
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1 FIFO PAGE REPLACEMENT : import java.io.*; public class FIFO public static void main(string[] args) throws IOException BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int frames, pointer =, hit =, fault =,ref_len; int buffer[]; int reference[]; int mem_layout[][]; System.out.println("Please enter the number of Frames: "); frames = Integer.parseInt(br.readLine()); System.out.println("Please enter the length of the Reference string: "); ref_len = Integer.parseInt(br.readLine()); reference = new int[ref_len]; mem_layout = new int[ref_len][frames]; buffer = new int[frames]; for(int j = ; j < frames; j++) buffer[j] = -; System.out.println("Please enter the reference string: "); for(int i = ; i < ref_len; i++) reference[i] = Integer.parseInt(br.readLine()); for(int i = ; i < ref_len; i++) int search = -; for(int j = ; j < frames; j++) if(buffer[j] == reference[i]) search = j; hit++; break; if(search == -) buffer[pointer] = reference[i]; fault++; pointer++; if(pointer == frames) pointer = ; for(int j = ; j < frames; j++)
2 mem_layout[i][j] = buffer[j]; for(int i = ; i < frames; i++) for(int j = ; j < ref_len; j++) System.out.printf("%d ",mem_layout[j][i]); System.out.println("The number of Hits: " + hit); System.out.println("Hit Ratio: " + (float)((float)hit/ref_len)); System.out.println("The number of Faults: " + fault); output:- Please enter the number of Frames: Please enter the length of the Reference string: Please enter the reference string: The number of Hits: 5 Hit Ratio:.5 The number of Faults:
3 LRU Page Replacement algorithm in java code in Java: import java.io.*; import java.util.*; public class LRU public static void main(string[] args) throws IOException BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int frames,pointer =, hit =, fault =,ref_len; Boolean isfull = false; int buffer[]; ArrayList<Integer> stack = new ArrayList<Integer>(); int reference[]; int mem_layout[][]; System.out.println("Please enter the number of Frames: "); frames = Integer.parseInt(br.readLine()); "); System.out.println("Please enter the length of the Reference string: ref_len = Integer.parseInt(br.readLine()); reference = new int[ref_len]; mem_layout = new int[ref_len][frames]; buffer = new int[frames]; for(int j = ; j < frames; j++) buffer[j] = -; System.out.println("Please enter the reference string: "); for(int i = ; i < ref_len; i++) reference[i] = Integer.parseInt(br.readLine()); for(int i = ; i < ref_len; i++) if(stack.contains(reference[i])) stack.remove(stack.indexof(reference[i])); stack.add(reference[i]); int search = -; for(int j = ; j < frames; j++) if(buffer[j] == reference[i]) search = j; hit++; break;
4 if(search == -) if(isfull) int min_loc = ref_len; for(int j = ; j < frames; j++) if(stack.contains(buffer[j])) int temp = stack.indexof(buffer[j]); if(temp < min_loc) min_loc = temp; pointer = j; buffer[pointer] = reference[i]; fault++; pointer++; if(pointer == frames) pointer = ; isfull = true; for(int j = ; j < frames; j++) mem_layout[i][j] = buffer[j]; for(int i = ; i < frames; i++) for(int j = ; j < ref_len; j++) System.out.printf("%d ",mem_layout[j][i]); System.out.println("The number of Hits: " + hit); System.out.println("Hit Ratio: " + (float)((float)hit/ref_len)); System.out.println("The number of Faults: " + fault); output:- Please enter the number of Frames: Please enter the length of the Reference string: Please enter the reference string:
5 The number of Hits: 8 Hit Ratio:.4 The number of Faults:
6 Optimal Page Replacement algorithm in java code in Java: import java.io.bufferedreader; import java.io.ioexception; import java.io.inputstreamreader; public class OptimalReplacement public static void main(string[] args) throws IOException BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); int frames, pointer =, hit =, fault =,ref_len; boolean isfull = false; int buffer[]; int reference[]; int mem_layout[][]; System.out.println("Please enter the number of Frames: "); frames = Integer.parseInt(br.readLine()); "); System.out.println("Please enter the length of the Reference string: ref_len = Integer.parseInt(br.readLine()); reference = new int[ref_len]; mem_layout = new int[ref_len][frames]; buffer = new int[frames]; for(int j = ; j < frames; j++) buffer[j] = -; System.out.println("Please enter the reference string: "); for(int i = ; i < ref_len; i++) reference[i] = Integer.parseInt(br.readLine()); for(int i = ; i < ref_len; i++) int search = -; for(int j = ; j < frames; j++) if(buffer[j] == reference[i]) search = j; hit++; break; if(search == -) if(isfull) int index[] = new int[frames]; boolean index_flag[] = new boolean[frames];
7 for(int j = i + ; j < ref_len; j++) for(int k = ; k < frames; k++) if((reference[j] == buffer[k]) && (index_flag[k] == false)) index[k] = j; index_flag[k] = true; break; int max = index[]; pointer = ; if(max == ) max = ; for(int j = ; j < frames; j++) if(index[j] == ) index[j] = ; if(index[j] > max) max = index[j]; pointer = j; buffer[pointer] = reference[i]; fault++; if(!isfull) pointer++; if(pointer == frames) pointer = ; isfull = true; for(int j = ; j < frames; j++) mem_layout[i][j] = buffer[j]; for(int i = ; i < frames; i++) for(int j = ; j < ref_len; j++) System.out.printf("%d ",mem_layout[j][i]); System.out.println("The number of Hits: " + hit); System.out.println("Hit Ratio: " + (float)((float)hit/ref_len)); System.out.println("The number of Faults: " + fault); output:-
8 Please enter the number of Frames: Please enter the length of the Reference string: Please enter the reference string: The number of Hits: Hit Ratio:.55 The number of Faults:
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