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Author: git-yogeshkumar

PriorityScheduling.cpp

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+//Priority Scheduling
+#include<bits/stdc++.h>
+//macro defination for "for loop"
+#define f(i,n) for(int i=0;i<n;i++)
+using namespace std;
+int main()
+{
+	cout<<"Enter the number of Processes : ";
+	int p;
+	cin>>p;
+	vector<int> tat(p,0); //vector to store turn around time
+	vector<int> wt(p,0); //vector to store waiting time  
+	vector<int> ct(p,0); //vector to store Completion Time
+	vector<pair<int,int> > pribt; //vector of pair having priority and burst time
+	f(i,p){
+		int priority;
+		int bt;
+		cout<<"Enter Burst Time and Priority of Process "<<i+1<<" :"<<endl;
+		cin>>bt>>priority;
+		pribt.push_back(make_pair(priority,bt));
+	}
+	//sort function of standard template library
+	sort(pribt.begin(),pribt.end());
+	//reverse function of standard template library
+	reverse(pribt.begin(),pribt.end());
+	// Calculating the waiting time for all processes
+	f(i,p){
+		if(i==0)
+		continue;
+		else
+		wt[i] = pribt[i-1].second + wt[i-1] ;
+	}
+	// calculating turnaround time by adding
+    // bt[i] + wt[i]
+	f(i,p){
+		tat[i]=pribt[i].second+wt[i];
+	}
+	//Calulation of Average wt and Turn Around time
+	int wt_total=0;
+	int tat_total=0;
+	f(i,p){
+		wt_total+=wt[i];
+		tat_total+=tat[i];
+	}
+	//format the dispaly results accordingly
+	cout<<endl;
+	cout<<"Priority 	Burst Time		 Wating Time		Turn Around Time"<<endl;
+	f(i,p)cout<<pribt[i].first<<"		"<<pribt[i].second<<"		"<<wt[i]<<"		"<<tat[i]<<endl;
+	cout<<"Average Waiting Time : "<<(float)wt_total/(float)p<<endl;
+	cout<<"Average Turn Around Time : "<<((float)tat_total/(float)p);
+}