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Author: saksham1908

FCFS.cpp.txt

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+
+// C++ program for implementation of FCFS  
+// scheduling 
+#include<iostream> 
+using namespace std; 
+  
+// Function to find the waiting time for all  
+// processes 
+void findWaitingTime(int processes[], int n,  
+                          int bt[], int wt[]) 
+{ 
+    // waiting time for first process is 0 
+    wt[0] = 0; 
+  
+    // calculating waiting time 
+    for (int  i = 1; i < n ; i++ ) 
+        wt[i] =  bt[i-1] + wt[i-1] ; 
+} 
+  
+// Function to calculate turn around time 
+void findTurnAroundTime( int processes[], int n,  
+                  int bt[], int wt[], int tat[]) 
+{ 
+    // calculating turnaround time by adding 
+    // bt[i] + wt[i] 
+    for (int  i = 0; i < n ; i++) 
+        tat[i] = bt[i] + wt[i]; 
+} 
+  
+//Function to calculate average time 
+void findavgTime( int processes[], int n, int bt[]) 
+{ 
+    int wt[n], tat[n], total_wt = 0, total_tat = 0; 
+  
+    //Function to find waiting time of all processes 
+    findWaitingTime(processes, n, bt, wt); 
+  
+    //Function to find turn around time for all processes 
+    findTurnAroundTime(processes, n, bt, wt, tat); 
+  
+    //Display processes along with all details 
+    cout << "Processes  "<< " Burst time  "
+         << " Waiting time  " << " Turn around time\n"; 
+  
+    // Calculate total waiting time and total turn  
+    // around time 
+    for (int  i=0; i<n; i++) 
+    { 
+        total_wt = total_wt + wt[i]; 
+        total_tat = total_tat + tat[i]; 
+        cout << "   " << i+1 << "\t\t" << bt[i] <<"\t    "
+            << wt[i] <<"\t\t  " << tat[i] <<endl; 
+    } 
+  
+    cout << "Average waiting time = " 
+         << (float)total_wt / (float)n; 
+    cout << "\nAverage turn around time = " 
+         << (float)total_tat / (float)n; 
+} 
+  
+// Driver code 
+int main() 
+{ 
+    //process id's 
+    int processes[] = { 1, 2, 3}; 
+    int n = sizeof processes / sizeof processes[0]; 
+  
+    //Burst time of all processes 
+    int  burst_time[] = {10, 5, 8}; 
+  
+    findavgTime(processes, n,  burst_time); 
+    return 0; 
+}