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194 changes: 189 additions & 5 deletions hello.cpp
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Original file line number Diff line number Diff line change
@@ -1,7 +1,191 @@
#include<bits/stdc++.h>
#include <iostream>
using namespace std;
inrt main(){
cout<<"hello world x";
return 0;
}

int main()
{
int n,bt[20],wt[20],tat[20],avwt=0,avtat=0,i,j,p[20],pos,temp;
cout<<"Enter total number of processes:\n";
cin>>n;
cout<<"Enter a process: \n"<<"1. FCFS\n"<<"2. SJF\n"<<"3. Priority\n"<<"4. Round Robin\n";
int x;
cin>>x;
switch(x)
{
case 1:
cout<<"Enter Process Burst Time\n";
for(i=0;i<n;i++)
{
cout<<i+1<<": ";
cin>>bt[i];
}
wt[0]=0;
for(i=1;i<n;i++)
{
wt[i]=0;
for(j=0;j<i;j++)
wt[i]+=bt[j];
}
cout<<"\nProcess\t\tBurst Time\tWaiting Time\tTurnaround Time\n";
for(i=0;i<n;i++)
{
tat[i]=bt[i]+wt[i];
avwt+=wt[i];
avtat+=tat[i];
cout<<i+1<<"\t\t"<<bt[i]<<"\t\t"<<wt[i]<<"\t\t"<<tat[i]<<"\n";
}
avwt/=n;
avtat/=n;
cout<<"\nAverage Waiting Time: " <<avwt<<"\n";
cout<<"Average Turnaround Time: " <<avtat;

break;
case 2:
cout<<"Enter Process Burst Time\n";
for(i=0;i<n;i++)
{
cout<<i+1<<": ";
cin>>bt[i];
p[i]=i+1;
}
for(i=0;i<n;i++)
{
pos=i;
for(j=i+1;j<n;j++)
{
if(bt[j]<bt[pos])
pos=j;
}
temp=bt[i];
bt[i]=bt[pos];
bt[pos]=temp;
temp=p[i];
p[i]=p[pos];
p[pos]=temp;
}
wt[0]=0;
for(i=1;i<n;i++)
{
wt[i]=0;
for(j=0;j<i;j++)
wt[i]+=bt[j];
}
cout<<"\nProcess\t\tBurst Time\tWaiting Time\tTurnaround Time\n";
for(i=0;i<n;i++)
{
tat[i]=bt[i]+wt[i];
avwt+=wt[i];
avtat+=tat[i];
cout<<p[i]<<"\t\t"<<bt[i]<<"\t\t"<<wt[i]<<"\t\t"<<tat[i]<<"\n";
}
avwt/=n;
avtat/=n;
cout<<"\nAverage Waiting Time: " <<avwt<<"\n";
cout<<"Average Turnaround Time: " <<avtat;

break;
case 3:
int pr[20];
cout<<"Enter Process Burst Time and Priority\n";
for(i=0;i<n;i++)
{
cout<<i+1<<": ";
cin>>bt[i]>>pr[i];
p[i]=i+1;
}
for (i=0;i<n;i++)
{
pos=i;
for (j=i+ 1 ;j<n;j++)
{
if (pr[j]<pr[pos])
pos=j;
}
temp=pr[i];
pr[i]=pr[pos];
pr[pos]=temp;
temp=bt[i];
bt[i]=bt[pos];
bt[pos]=temp;
temp=p[i];
p[i]=p[pos];
p[pos]=temp;
}
wt[0]=0;
for(i=1;i<n;i++)
{
wt[i]=0;
for(j=0;j<i;j++)
wt[i]+=bt[j];
}
cout<<"\nProcess\t\tBurst Time\tWaiting Time\tTurnaround Time\n";
for(i=0;i<n;i++)
{
tat[i]=bt[i]+wt[i];
avwt+=wt[i];
avtat+=tat[i];
cout<<p[i]<<"\t\t"<<bt[i]<<"\t\t"<<wt[i]<<"\t\t"<<tat[i]<<"\n";
}
avwt/=n;
avtat/=n;
cout<<"\nAverage Waiting Time: " <<avwt<<"\n";
cout<<"Average Turnaround Time: " <<avtat;
break;
case 4:
int count,j,time,remain,flag=0,quantum, min= 0,start=0;
int wait_time=0,turnaround_time=0,at[10],bt[10],rt[10];
remain=n;
count=0;
while(count<n)
{
cout<<"Enter Arrival Time and Burst Time for Process " <<count+1<<": ";
cin>>at[count];
cin>>bt[count];
rt[count]=bt[count];
count++;
}
cout<<"Enter Time Quantum: ";
cin>>quantum;
cout<<"\nProcess\t\tBurst Time\tWaiting Time\tTurnaround Time\n";
min=at[0];
for(i=1;i<n;i++)
{
if (at[i]<=min)
{
min=at[i];
start=i;
}
}
for(time=min,count=start;remain!=0;)
{
if(rt[count]<=quantum && rt[count]> 0 )
{
time+=rt[count];
rt[count]= 0;
flag=1;
}
else if(rt[count]>0)
{
rt[count]-=quantum;
time+=quantum;
}
if(rt[count]==0&&flag==1)
{
remain--;
cout<<count+ 1<<"\t\t"<<bt[count]<<"\t\t"<< time-at[count]-bt[count]<<"\t\t"<< time-at[count]<<"\n";
wait_time+=time-at[count]-bt[count];
turnaround_time+=time-at[count];
flag= 0 ;
}
if (count==n-1)
count= 0;
else if(at[count+1]<=time)
count++;
else
count= 0;
}
cout<<"\nAverage Waiting Time= " <<wait_time/n;
cout<< "\nAvg Turnaround Time = " <<turnaround_time/n;
break;
}
return 0;
}