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//C Program to Simulate Round Robin CPU Scheduling by Nived Kannada //NOTE: IN THIS, WE ARE ASSUMING THAT ARRIVAL TIME IS 0 FOR ALL PROCESSES. #include<stdio.h> //We are defining functions to calculate Turnaroundtime and waiting time. //Function to find Turnaround time int turnarroundtime(int p[], int n, int bt[], int wt[], int tat[]) { int i; for (i = 0; i < n ; i++) tat[i] = bt[i] + wt[i]; return 1; } //Function to calculate waiting time int waitingtime(int p[], int n, int bt[], int wt[], int quantum) { int rem_bt[n]; //rem_bt is remaining burst time for each process(stored as array). It is initially set as equal to bt[]. //Copying bt[] to rem_bt[] for (int i = 0 ; i < n ; i++) rem_bt[i] = bt[i]; int t = 0; //Setting initial time as 0 //Traversing processes in Round Robin manner until all of them are not done. while (1) { int finished = 1; for (int i = 0 ; i < n; i++) //Traversing through each process one by one repeatedly. { //We have to process only if remaining burst time of a process is greater than zero. if (rem_bt[i] > 0) //Checking if remaining burst time of current process is greater than zero. { finished = 0; // rem_bt[i]>0 means the current process is not finished yet. if (rem_bt[i] > quantum) { t = t+quantum; //Adding time_quantum to current time t. rem_bt[i] = rem_bt[i] - quantum; //Subtracting time_quantum from remaining burst time. } else // ie. if remaining burst time is less than time_quantum { t = t + rem_bt[i]; //adding the remaining burst time with current time t. wt[i] = t - bt[i]; // Waiting time = current time - burst time of current process. //in this case, rem_bt[i] is less than the time_quantum. //ie. process will be finished in this cycle. So we can set rem_bt[i] as 0. rem_bt[i] = 0; } } } //If all processes are finished if (finished == 1) { break; } } return 1; } //Main Function void main() { int n, bt[20], at[20],p[20],wt[20],tat[20] ,i, total=0, time_quantum; //Here a new variable is introduced --> time_quantum int x; float avgwt=0, avgtat=0; //Reading number of processes from input. printf("Enter number of processes: "); scanf("%d",&n); //Reading Burst times of all processes. (( ASSUMING ARRIVAL TIME IS 0 FOR ALL PROCESSES. )) printf("Enter the Burst time value of each process: \n"); for(i=0;i<n;i++) { p[i]=i; at[i]=0; printf("Burst Time of P[%d]: ",i); scanf("%d",&bt[i]); } //Reading the Time Quantum value printf("Enter the Time Quantum: "); scanf("%d",&time_quantum); //Calling the functions to calculate waiting time and turnaround time waitingtime(p, n, bt, wt, time_quantum); turnarroundtime(p, n, bt, wt, tat); //Displaying Table printf("\n\tPID\tAT\tBT\tWT\tTAT\n"); for(i=0;i<n;i++) { printf("\t%d\t%d\t%d\t%d\t%d\n",p[i],at[i],bt[i],wt[i],tat[i]); } //Calculating Average Waiting time and Average Turnaround Time for(i=0;i<n;i++) { avgwt = avgwt + wt[i]; avgtat = avgtat + tat[i]; } avgwt = avgwt/n; avgtat = avgtat/n; //Displaying Average WT and Average TAT printf("\nAverage WT = %f\n", avgwt); printf("\nAverage TAT = %f\n", avgtat); } //END OF PROGRAM

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