CPU-Scheduling FCFS(First Come First Serve) - SYSPRO

#include<stdio.h>
#define MAX 3

struct job
{
int at, bt, wt, tat, index;
};

void main()
{
struct job p[MAX], temp;
int i, j, clk, idl, ttat, twt;
clrscr();

for(i=0;i<MAX;i++)
{
printf("\nEnter AT : ");
scanf("%d",&p[i].at);
printf("\nEnter BT : ");
scanf("%d",&p[i].bt);
p[i].index=i+1;
}

printf("\nPro    AT BT");
for(i=0;i<MAX;i++)
{
printf("\nP%d  %d %d",p[i].index,p[i].at,p[i].bt);
}

for(i=0;i<MAX;i++)
{
for(j=i+1;j<MAX;j++)
{
if(p[i].at>p[j].at)
{
temp=p[j];
p[j]=p[i];
p[i]=temp;
}
}
}
printf("\nAfter sort\n");

printf("\nPro    AT BT");
for(i=0;i<MAX;i++)
{
printf("\n%d %d %d",p[i].index,p[i].at,p[i].bt);
}


clk=0;
idl=0;

printf("\nGantt Chart : ");

printf(" %d ",clk);

for(i=0;i<MAX;i++)
{
if(clk<p[i].at)
{
idl+=p[i].at-clk;
clk=p[i].at;
printf("|/////| %d ",clk);
}
p[i].wt=clk-p[i].at;
clk=clk+p[i].bt;
p[i].tat=clk-p[i].at;
printf("| P%d | %d ",p[i].index,clk);
}

printf("\n\n\nAfter Exc\n");
printf("\nPro    AT   BT  WT   TAT");
for(i=0;i<MAX;i++)
{
printf("\n%d %d %d %d %d",p[i].index,p[i].at,p[i].bt,p[i].wt,p[i].tat);
}


getch();
}