RR

#include<stdio.h>
#include<stdlib.h>
typedef struct process
{
    char p_name[2];
    int cpu_time,arrival_time,finish_time,turn_time;
    int waiting_time,start_time,cpu_temp,flag;
}process;

int main()
{
    int no,i,total_cpu_time=0,j,processes,running_time,process_no=0,current,x,time;
    float avg_turn_time=0,avg_waiting_time=0;
    process obj[7];
    printf("\nEnter no of processes:");
    scanf("\n%d",&no);

//Accepts input from user
    for(i=0;i<no;i++)
    {
        printf("\nEnter Process ID, Arrival Time and CPU time\n");
        scanf("%s%d%d",&obj[i].p_name,&obj[i].arrival_time,&obj[i].cpu_time);
        obj[i].cpu_temp=obj[i].cpu_time;
        obj[i].flag=0;
        total_cpu_time=total_cpu_time+obj[i].cpu_time;
    }

    printf("\nEnter time quantam for each process");
    scanf("%d",&time);

    i=0;
    x=0;
    processes=no;
    running_time=0;
    printf("\nRunning Time  Executig Process\n");
    while(running_time<total_cpu_time)
    {
        for(j=0;j<time;j++)
        {
            if(obj[i].cpu_temp==obj[i].cpu_time)
            {
                obj[i].start_time=running_time+1;
            }
            if(obj[i].cpu_temp!=0)
            {
                obj[i].cpu_temp=obj[i].cpu_temp-1;
                printf("\n\t%d\t%s",running_time,obj[i].p_name);
                running_time=running_time+1;
            }
            if(obj[i].cpu_temp==0 && obj[i].flag!=1)
            {
                obj[i].flag=1;
                obj[i].finish_time=running_time;
                printf("\n%d",obj[i].finish_time);
            }
        }

        i++;
        if(i==no)
        {
            i=0;
        }
    }
//calculates time for each process
    for(i=0;i<no;i++)
    {
        obj[i].turn_time=obj[i].finish_time;
        obj[i].waiting_time=obj[i].turn_time - obj[i].cpu_time;

        avg_turn_time=avg_turn_time+obj[i].turn_time;
        avg_waiting_time=avg_waiting_time+obj[i].waiting_time;
    }
//Display all times
    printf("\n----------------------------------------------------------");
    printf("\nP_ID\tArrival_Time  CPU_time  Start_Time  Finish_Time  Turn_Time   Waiting_Time\n");
    printf("\n----------------------------------------------------------");
   
    for(i=0;i<no;i++)
    {
printf("\n%s\t%d\t%d\t%d\t%d\t%d\t%d",obj[i].p_name,obj[i].arrival_time,obj[i].cpu_time,obj[i].start_time,obj[i].finish_time,obj[i].turn_time,obj[i].waiting_time);
    }

    printf("\n");
    avg_turn_time=avg_turn_time/no;
    avg_waiting_time=avg_waiting_time/no;
   
    printf("\nAverage Turnaround Time=%f",avg_turn_time);
    printf("\nAverage Waiting Time=%f",avg_waiting_time);
    printf("\n");
}