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shortest_job_first_scheduling.c
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shortest_job_first_scheduling.c
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#include<stdio.h>
void sort(int *a,int *b,int n){
int temp,x;
for(int i=0;i<n;i++){
x=i;
for(int j=i+1;j<n;j++){
if(a[j]<a[i])
x=j;
}
temp=a[i];
a[i]=a[x];
a[x]=temp;
temp=b[i];
b[i]=b[x];
b[x]=temp;
}
}
void main(){
int burst[30],p[30],wait[30],turn_t[30],i,j,n;
printf("enter no.of processes:");
scanf("%d",&n);
printf("\n");
for(i=0;i<n;i++){
printf("Enter the burst time of process p%d :",i+1);
scanf("%d",&burst[i]);
p[i]=i+1;
}
//printf("%d",burst[2]);
sort(burst,p,n);
//printf("%d",burst[2]);
wait[0]=0;
turn_t[0]=burst[0];
for(i=1;i<n;i++){
wait[i]=burst[i-1]+wait[i-1];
turn_t[i]=wait[i]+burst[i];
}
// for(i=0;i<n;i++){
// printf("%d",turn_t[i]);
// }
// printf("wait time is:%d",turn_t[2]);
float avg_wt,avg_turn_t;
int sum=0,sum1=0;
for(i=0;i<n;i++){
sum=sum+wait[i];
sum1=sum1+turn_t[i];
}
avg_wt=(float)sum/n;
avg_turn_t=(float)sum1/n;
printf("JOB\tBurst Time\tWaiting TIme\tTurnaround Time\n");
for(i=0;i<n;i++){
printf("%d\t%d\t\t%d\t\t%d\t\t\n",p[i],burst[i],wait[i],turn_t[i]);
}
printf("\nAverage waiting time is %f",avg_wt);
printf("\nAverage turn-around time is %f\n",avg_turn_t);
}