First In First Serve Using Data Structures in C++

[Poojith]

my sample code here

#include<iostream.h>
#include<conio.h>
#include<stdlib.h>
using namespace std;
 
struct process
{
int pn;
float at,bt,ct,tat,wt;
struct process *next;
}process;
////////////////////////////////////////////////////
 
float total_wait_time=0,total_turn_around_time=0;
int n;
 process *get_process(float a,float b)
{
static int i=1;
pr=new(process);
pr->at=a,pr->bt=b;
pr->pn=i++;
pr->next=NULL;
return pr;
 
void insert(process *ptr,float a,float b)
{
process *pro,*temp;
pro=get_process(a,b);
while(ptr->next!=NULL)
{
temp=ptr;
ptr=ptr->next;
if(ptr->at>a);
{
pro->next=ptr;
temp->next=pro;
return;
}
}
ptr->next=pro;
}
void display(process *ptr)
{process *temp=ptr->next;
cout<<"Process\tArrival time\tBurst time\tCompletion time\tWaiting time\tTurn arround time\n";
while(temp!=NULL)
{
cout<<"P[%d]\t%3.2f\t\t%3.2f\t\t%3.2f\t\t%3.2f\t\t%3.2f\n",temp->pn,temp->at,temp->bt,temp->ct,temp->wt,temp->tat;
temp=temp->next;
}
cout<<"Average waiting time :%3.2f\nAverage turn arround time :%3.2f\n",total_wait_time/n,total_turn_around_time/n;
}
void ganttchart(process *ptr)
{
process *temp,*t;
temp=ptr->next;
t=ptr;
while(temp!=NULL)
{
temp->ct=t->ct+temp->bt;
t=temp;
temp=temp->next;
}
}
void wt_and_tat(process *ptr)
while(temp!=NULL)
{
temp->tat=temp->ct-temp->at;
total_turn_around_time+=temp->tat;
temp->wt=temp->tat-temp->bt;
total_wait_time+=temp->wt;
temp=temp->next;
}
}
////////////////////////////////////////////////////////////////
 
int main()
{
int i;
float a,b;
start=new(process);
start->next=NULL;
cout<<"=========FCFS Algo==========\nEnter the no. of process : ";
cin>>&n;
for(i=0;i<n;i++)
{
cout<<"Process P("<<i+1<<")\n";
cout<<"Arival time ?";
cin>>&b;
insert(start,a,b);
cout<<"\n";
ganttchart(start);
wt_and_tat(start);
display(start);
return 0;
}
 
 
 

.
In my code,
I am getting an error like this"error: excepted constructor, destructor, or type conversion before'*' token"
Please, help me out this to overcome this error.

[dev7060]

Mind showing more of your code?

[Poojith]

Can U please help me now

[dev7060]

I tried to run the code in CodeBlocks. It showed me tons of errors. Also, I couldn't find the one you asked for. Looks like you are implementing FCFS CPU scheduling algo. Maybe try to post the code after removing the basic syntax errors of curly braces and stuff.

[Poojith]

#include<stdio.h>
 
#include<stdlib.h>
 
typedef struct process
 
{
 
int pn;
 
float at,bt,ct,tat,wt;
 
struct process *next;
 
}process;
 
/////////////////////////////////////////
 
float total_wait_time=0,total_turn_around_time=0;
 
int n;
 
process *get_process(float a,float b)
 
{
 
static int i=1;
 
process *pr=(process *)malloc(sizeof(process));
 
pr->at=a,pr->bt=b;
 
pr->pn=i++;
 
pr->next=NULL;
 
return pr;
 
}
 
void insert(process *ptr,float a,float b)
 
{
 
process *pro,*temp;
 
pro=get_process(a,b);
 
while(ptr->next!=NULL)
 
{
 
temp=ptr;
 
ptr=ptr->next;
 
if(ptr->at>a)
 
{
 
pro->next=ptr;
 
temp->next=pro;
 
return;
 
}
 
}
 
ptr->next=pro;
 
}
 
void display(process *ptr)
 
{
 
process *temp=ptr->next;
 
printf("Process\tArrival time\tBurst time\tCompletion time\tWaiting time\tTurn arround time\n");
 
while(temp!=NULL)
 
{
 
printf("P[%d]\t%3.2f\t\t%3.2f\t\t%3.2f\t\t%3.2f\t\t%3.2f\n",temp->pn,temp->at,temp->bt,temp->ct,temp->wt,temp->tat);
 
temp=temp->next;
 
}
 
printf("Average waiting time :%3.2f\nAverage turn arround time :%3.2f\n",total_wait_time/n,total_turn_around_time/n);
 
}
 
void ganttchart(process *ptr)
 
{
 
process *temp,*t;
 
temp=ptr->next;
 
t=ptr;
 
while(temp!=NULL)
 
{
 
temp->ct=t->ct+temp->bt;
 
t=temp;
 
temp=temp->next;
 
}
 
}
 
void wt_and_tat(process *ptr)
 
{
 
process *temp=ptr->next;
 
while(temp!=NULL)
 
{
 
temp->tat=temp->ct-temp->at;
 
total_turn_around_time+=temp->tat;
 
temp->wt=temp->tat-temp->bt;
 
total_wait_time+=temp->wt;
 
temp=temp->next;
 
}
 
}
 
//////////////////////////////
 
int main()
 
{
 
int i;
 
float a,b;
 
process *START=(process *)malloc(sizeof(process));
 
START->next=NULL;
 
printf("=========FCFS Algo==========\nEnter the no. of process : ");
 
scanf("%d",&n);
 
for(i=0;i<n;i++)
 
{
 
printf("Process P(%d) \n",i+1);
 
printf("Arival time ? ");
 
scanf("%f",&a);
 
printf("Exicution time ? ");
 
scanf("%f",&b);
 
insert(START,a,b);
 
printf("\n");
 
}
 
ganttchart(START);
 
wt_and_tat(START);
 
display(START);
 
return 0;
 
}
 
 

Can U please change this to C++

[dev7060]

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