Average Turn around Time Calculation

#include<stdio.h>

#include<conio.h>

void
main()

{

int ch,i,j,n,pd[10],pd1[10];

float aw,at,t,k;

clrscr();

printf("\n\n\t\tAverage
Turn Around Time Calculation");

printf("\n\t\t~~~~~~~
~~~~ ~~~~~~ ~~~~ ~~~~~~~~~~~");

do

{

printf("\n
Enter the number of Process(n>2):");

scanf("%d",&n);

}while(n<2);

for(i=1;i<=n;i++)

{

printf("\nEnter
the CPU Burst Time of process %d:",i);

scanf("%d",&pd[i]);

}

do

{

printf("\n\nSelect
the Scheduling Choice:");

printf("\n\t1.First
Come First Service(FCFS)");

printf("\n\t2.Shortest
Job First(SJF)");

printf("\n\t3.Exit\n\tEnter
Your Choice:");

scanf("%d",&ch);

switch(ch)

{

case
1:

printf("\n\n\t\tFirst
Come First Service(FCFS)");

printf("\n\t\t~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~");

t=aw=at=k=0;

for(i=1;i<=n;i++)

{

k=k+t;

t=t+pd[i];

}

aw=k/n;

at=t/n;

printf("\n\n\tAverage
waiting time => %4.2f",aw);

printf("\n\n\tAverage
process time => %4.2f",at);

printf("\n\n\tAverage
Turn Around time => %4.2f",aw+at);

break;

case
2:

printf("\n\n\t\tShortest
Job First(SJF)");

printf("\n\t\t~~~~~~~~~~~~~~~~~~~~~~~");

for(i=1;i<=n;i++)

pd1[i] = pd[i];

for(i=1;i<=n;i++)

for(j=1;j<n;j++)

if(pd1[i]<pd1[j])

{

t = pd1[i]; pd1[i] = pd1[j]; pd1[j] = t;

}

t=k=0;

for(i=1;i<=n;i++)

{

k=k+t;

t=t+pd1[i];

}

aw=k/n;

at=t/n;

printf("\n\n\tAverage
waiting time => %4.2f",aw);

printf("\n\n\tAverage
process time => %4.2f",at);

printf("\n\n\tAverage
turn Around time =>%4.2f",aw+at);

break;

}

}while(ch<=2);

}

Click to Download Source Code
or
Copy and past in browser address bar
http://sites.google.com/site/senthilmcan/software-programs