SystemsProgrammingAndOperatingSystem/Codes/Group B/Code-B6.cpp

#include <iostream>
using namespace std;

int blocks[] = {100, 500, 200, 300, 600};
int processes[] = {212, 417, 112, 426};
int blkSize = sizeof(blocks) / sizeof(blocks[0]);
int prSize = sizeof(processes) / sizeof(processes[0]);

void FirstFit() {
  cout<<endl<<"FIRST FIT:";
  for (int i=0; i<prSize; i++) {
      bool check = false;
    for(int j=0; j<blkSize; j++) {
      if ((blocks[j] - processes[i] >= 0)) {
        blocks[j] -= processes[i];
        check = true;
        cout<<endl<<"Process "<<processes[i]<<" has been allocated to block "<<j+1;
        break;
      }
    }
    if (check == false) {
      cout<<endl<<"Process "<<processes[i]<<" has not been allocated.";
    }
  }
}

void NextFit() {
  int j = 0;
  cout<<endl<<"NEXT FIT:";
  for (int i=0; i<prSize; i++) {
    bool check = false;
    for (int k=0; k<blkSize; k++) {
      if ((blocks[j] - processes[i]) >= 0) {
        blocks[j] = blocks[j] - processes[i];
        cout<<endl<<"Process "<<processes[i]<<" has been allocated to block "<<j+1;
        check = true;
        break;
      }
      j = (j + 1) % blkSize;
    }
    if (check == false) {
      cout<<endl<<"Process "<<processes[i]<<" has not been allocated.";
    }
  }
}

void BestFit() {
  cout<<endl<<"BEST FIT:";
  for (int i=0; i<prSize; i++) {
    bool check = false;
    int k, store = 999;
    for (int j=0; j<blkSize; j++) {
      if ((blocks[j] - processes[i]) >= 0 && (blocks[j] - processes[i]) < store) {
        k = j + 1;
        store = blocks[j] - processes[i];
        check = true;
      }
    }
    if (check == false) {
      cout<<endl<<"Process "<<processes[i]<<" was not allocated to any block.";
    }
    else {
      blocks[k - 1] -= processes[i];
      cout<<endl<<"Process "<<processes[i]<<" was allocated to block "<<k;
    }
  }
}

void WorstFit() {
  cout<<endl<<"WORST FIT:";
  for (int i=0; i<prSize; i++) {
    bool check = false;
    int k, store = -1;
    for (int j=0; j<blkSize; j++) {
      if ((blocks[j] - processes[i] >= 0 && (blocks[j] - processes[i] > store))) {
        k = j + 1;
        store = blocks[j] - processes[i];
        check = true;
      }
    }
    if (check == false) {
      cout<<endl<<"Process "<<processes[i]<<" was not allocated to any block.";
    }
    else {
    blocks[k - 1] -= processes[i];
    cout<<endl<<"Process "<<processes[i]<<" was allocated to block "<<k;
    }
  }
}

int main () {
  // ONLY RUN ONE FUNCTION AT A TIME.
  // FirstFit();
  // NextFit();
  BestFit();
  // WorstFit();
  return 0;
}