RR

#include<stdio.h>

int main()
{   
    int n;
    printf("Enter Total Process: ");
    scanf("%d",&n);

    int at[n], bt[n], rt[n];
    printf("Enter Arrival Time and Burst Time for: ");
    for(int i = 0; i < n; i++)
    {
        printf("Process Number %d :", i+1);
        scanf("%d %d", &at[i], &bt[i]);
        rt[i] = bt[i];
    }

    int tq, remain = n;
    printf("Enter Time Quantum: ");
    scanf("%d", &tq);

    int flag = 0;
    int wt = 0, tat = 0;
    
    printf("\nProcess \t Turnaround Time \t Waiting Time\n");
    for(int sum = 0, i = 0; remain != 0; )
    {
        if(rt[i] <= tq && rt[i] > 0)
        {
            sum = sum + rt[i];
            rt[i] = 0;
            flag = 1;
        }
        else if(rt[i] > 0)
        {
            rt[i] = rt[i] - tq;
            sum += tq;
        }
        if(rt[i] == 0 && flag == 1)
        {
            remain--;
            printf("P[%d] \t\t %d \t %d\n", i + 1, sum - at[i], sum - at[i] - bt[i]);
            wt += sum -at[sum] - bt[i];
            tat += sum - at[sum];
            flag=0;
        }
        if(i == n-1)
            i = 0;
        else if(at[i + 1] <= sum)
            i++;
        else
            i = 0;
    }
    printf("\nAverage Waiting Time= %f\n",wt*1.0/n);
    printf("Avg Turnaround Time = %f\n",tat*1.0/n);
    return 0;
}