C Program for Round Robin (RR) CPU scheduling

#include<stdio.h>


//Calculate the average time
void RoundRobin(int bt[],int n,int quantum)
{
	int wt[n], tat[n], total_wt = 0, total_tat = 0;

	//  Find waiting time of all processes
	//Store remaining burst time
	int rem_bt[n],i;
	for ( i = 0 ; i < n ; i++)
		rem_bt[i] = bt[i];

	int t = 0; // Current time
	while (1)
	{
		int done = 1;
		for ( i = 0 ; i < n; i++)
		{
			
			if (rem_bt[i] > 0)
			{
				done = 0; // pending process

				if (rem_bt[i] > quantum)
				{
				
					t += quantum;

					
					rem_bt[i] -= quantum;
				}
				else
				{
					t = t + rem_bt[i];

					// Waiting time = current time- time
					// used in this process
					wt[i] = t - bt[i];
                    //process is fully executed
					rem_bt[i] = 0;
				}
			}
		}

		
		if (done == 1)
		break;
	}

	//Find turn around time for all processes
	for (int i = 0; i < n ; i++){
		tat[i] = bt[i] + wt[i];
		total_wt += wt[i];
		total_tat += tat[i];
	}


 // Calculate average waiting and turnaround times
    float avg_wt = (float)total_wt / n;
    float avg_tat = (float)total_tat / n;

    // Display process details
    printf("\nProcess\tBurst Time\tWaiting Time\tTurnaround Time\n");
    printf("-------------------------------------------------\n");
    for (int i = 0; i < n; i++) {
        printf("%d\t%d\t\t%d\t\t%d\n", i + 1, bt[i], wt[i], tat[i]);
    }

    printf("\nAverage Waiting Time: %.2f\n", avg_wt);
    printf("Average Turnaround Time: %.2f\n", avg_tat);
}



int main() {
    int n;

    // Input number of processes
    printf("Enter the number of processes: ");
    scanf("%d", &n);

    int bt[n];

    // Input burst time for each process
    printf("Enter Burst Time for each process:\n");
    for (int i = 0; i < n; i++) {
        printf("Process %d Burst Time: ", i + 1);
        scanf("%d", &bt[i]);
    }
    
    int time_quantum = 2;
    
    // Call FCFS scheduling function
    RoundRobin(bt,n,time_quantum);

    return 0;
}

Enter the number of processes: 3
Enter Burst Time for each process:
Process 1 Burst Time: 5
Process 2 Burst Time: 4
Process 3 Burst Time: 6

Process	Burst Time	Waiting Time	Turnaround Time
-------------------------------------------------
1	5		8		13
2	4		6		10
3	6		9		15

Average Waiting Time: 7.67
Average Turnaround Time: 12.67