#include <stdio.h>
int main()
{
int i,x=-1,k[10],m=0,n,t,s=0;
int a[50],temp,b[50],p[10],bur[10],bur1[10];
int wat[10],tur[10],ttur=0,twat=0,j=0;
float awat,atur;
printf("Enter no. of process : ");
scanf("%d", &n);
for(i=0; i<n; i++)
{
printf("Burst time for process P%d : ", (i+1));
scanf("%d", &bur[i]);
bur1[i] = bur[i];
}
printf("Enter the time slice (in ms) : ");
scanf("%d", &t);
for(i=0; i<n; i++)
{
b[i] = bur[i] / t;
if((bur[i]%t) != 0)
b[i] += 1;
m += b[i];
}
printf("\n\t\tRound Robin Scheduling\n");
printf("\nGANTT Chart\n");
for(i=0; i<m; i++)
printf("--------");
printf("\n");
a[0] = 0;
while(j < m)
{
if(x == n-1)
x = 0;
else
x++;
if(bur[x] >= t)
{
bur[x] -= t;
a[j+1] = a[j] + t;
if(b[x] == 1)
{
p[s] = x;
k[s] = a[j+1];
s++;
}
j++;
b[x] -= 1;
printf(" P%d |", x+1);
}
else if(bur[x] != 0)
{
a[j+1] = a[j] + bur[x];
bur[x] = 0;
if(b[x] == 1)
{
p[s] = x;
k[s] = a[j+1];
s++;
}
j++;
b[x] -= 1;
printf(" P%d |",x+1);
}
}
printf("\n");
for(i=0;i<m;i++)
printf("--------");
printf("\n");
for(j=0; j<=m; j++)
printf("%d\t", a[j]);
for(i=0; i<n; i++)
{
for(j=i+1; j<n; j++)
{
if(p[i] > p[j])
{
temp = p[i];
p[i] = p[j];
p[j] = temp;
temp = k[i];
k[i] = k[j];
k[j] = temp;
}
}
}
for(i=0; i<n; i++)
{
wat[i] = k[i] - bur1[i];
tur[i] = k[i];
}
for(i=0; i<n; i++)
{
ttur += tur[i];
twat += wat[i];
}
printf("\n\n");
for(i=0; i<30; i++)
printf("-");
printf("\nProcess\tBurst\tTrnd\tWait\n");
for(i=0; i<30; i++)
printf("-");
for (i=0; i<n; i++)
printf("\nP%-4d\t%4d\t%4d\t%4d", p[i]+1, bur1[i],
tur[i],wat[i]);
printf("\n");
for(i=0; i<30; i++)
printf("-");
awat = (float)twat / n;
atur = (float)ttur / n;
printf("\n\nAverage waiting time : %.2f ms", awat);
printf("\nAverage turn around time : %.2f ms\n", atur);
}