os roundrobin

code:
#include<stdio.h>  
    #include<stdlib.h>  
     
    void main()  
    {  
        // initlialize the variable name  
        int i, NOP, sum=0,count=0, y, quant, wt=0, tat=0, at[10], bt[10], temp[10];  
        float avg_wt, avg_tat;  
        printf(" Total number of process in the system: ");  
        scanf("%d", &NOP);  
        y = NOP; // Assign the number of process to variable y  
     
    // Use for loop to enter the details of the process like Arrival time and the Burst Time  
    for(i=0; i<NOP; i++)  
    {  
    printf("\n Enter the Arrival and Burst time of the Process[%d]\n", i+1);  
    printf(" Arrival time is: \t");  // Accept arrival time  
    scanf("%d", &at[i]);  
    printf(" \nBurst time is: \t"); // Accept the Burst time  
    scanf("%d", &bt[i]);  
    temp[i] = bt[i]; // store the burst time in temp array  
    }  
    // Accept the Time qunat  
    printf("Enter the Time Quantum for the process: \t");  
    scanf("%d", &quant);  
    // Display the process No, burst time, Turn Around Time and the waiting time  
    printf("\n Process No \t\t Burst Time \t\t TAT \t\t Waiting Time ");  
    for(sum=0, i = 0; y!=0; )  
    {  
    if(temp[i] <= quant && temp[i] > 0) // define the conditions  
    {  
        sum = sum + temp[i];  
        temp[i] = 0;  
        count=1;  
        }    
        else if(temp[i] > 0)  
        {  
            temp[i] = temp[i] - quant;  
            sum = sum + quant;    
        }  
        if(temp[i]==0 && count==1)  
        {  
            y--; //decrement the process no.  
            printf("\nProcess No[%d] \t\t %d\t\t\t\t %d\t\t\t %d", i+1, bt[i], sum-at[i], sum-at[i]-bt[i]);  
            wt = wt+sum-at[i]-bt[i];  
            tat = tat+sum-at[i];  
            count =0;    
        }  
        if(i==NOP-1)  
        {  
            i=0;  
        }  
        else if(at[i+1]<=sum)  
        {  
            i++;  
        }  
        else  
        {  
            i=0;  
        }  
    }  
    // represents the average waiting time and Turn Around time  
    avg_wt = wt * 1.0/NOP;  
    avg_tat = tat * 1.0/NOP;  
    printf("\n Average Turn Around Time: \t%f", avg_tat);  
    printf("\n Average Waiting Time: \t%f",avg_wt);
    }
    
   output:
Total number of process in the system: 4

 Enter the Arrival and Burst time of the Process[1]
 Arrival time is: 	2
 
Burst time is: 	6

 Enter the Arrival and Burst time of the Process[2]
 Arrival time is: 	4
 
Burst time is: 	7

 Enter the Arrival and Burst time of the Process[3]
 Arrival time is: 	4
 
Burst time is: 	8

 Enter the Arrival and Burst time of the Process[4]
 Arrival time is: 	8
 
Burst time is: 	2
Enter the Time Quantum for the process: 	3

 Process No 		 Burst Time 		 TAT 		 Waiting Time 
Process No[1] 		 6				 4			 -2
Process No[4] 		 2				 6			 4
Process No[2] 		 7				 17			 10
Process No[3] 		 8				 19			 11
 Average Turn Around Time: 	11.500000
 Average Waiting Time: 	5.750000